
Functional Foods · Fermented food
Kimchi
Brassica rapa (napa cabbage, main ingredient), fermented · also called Kimchee, Korean fermented cabbage
Kimchi is a Korean side dish of salted, spiced and fermented vegetables, most often napa cabbage. A few small trials found lower blood sugar, blood pressure and weight markers with fermented kimchi, but those trials did not compare it with no kimchi. It is high in sodium, it is eaten unheated, and food poisoning outbreaks have been traced to contaminated kimchi. Pickled vegetables as a group are linked to higher stomach cancer risk in observational studies.
General information, not medical advice. Last substantive update · Not medically reviewed. A named clinician has not signed off on this page. How this page is made
About Kimchi
Kimchi is a Korean side dish of fermented vegetables. It is a food, not a proven remedy: the benefit findings come from a few small trials and from observational studies, and the best-documented cautions are sodium, contamination outbreaks and stomach cancer links for pickled vegetables.
What it is
Kimchi is a traditional Korean side dish of fermented vegetables. A 2024 review says it ferments on its own, mainly by lactic acid bacteria that come from the raw ingredients, reaching about 9 to 10 log colony-forming units per gram. A lab study lists red pepper, garlic, ginger, green onion and radish as essential ingredients and anchovy sauce and sugar among optional ones, so recipes differ.
Napa cabbage is the usual main vegetable. GBIF lists Brassica rapa L. as the accepted species name; the older name Brassica rapa subsp. pekinensis is a synonym. We do not give recipes or fermentation methods.
Nutrition on paper
USDA lists kimchi at 15 kcal, 1.1 g of protein, 2.4 g of carbohydrate, 1.6 g of fibre, 33 mg of calcium, 2.5 mg of iron, 151 mg of potassium, 52 micrograms of folate and 43.6 micrograms of vitamin K per 100 g. One cup (150 g) has about 23 kcal, 2.4 g of fibre and 65 micrograms of vitamin K.
Sodium is the standout number: 498 mg per 100 g, or about 747 mg in a cup. That is about 22% of the 2,300 mg daily limit per 100 g. This is one generic USDA entry; real products vary, so read the label.
What the research shows
Three small randomized trials from Korea are the main human evidence. They compared fresh with fermented kimchi, or a low amount with a high amount. None of these three compared kimchi with no kimchi. Fermented kimchi went with lower blood pressure and insulin resistance than fresh in people with overweight or prediabetes (22 and 21 people), and a 7-day trial in 100 healthy young adults found lower total and LDL cholesterol.
A 2025 pooled analysis of five intervention studies (205 people) found fasting glucose 1.93 mg/dL lower. Triglycerides (28.9 mg/dL lower) and blood pressure (about 3.5 and 2.7 mmHg lower) fell only after studies that added to the differences between trials were left out. The authors say the results need caution because there are few studies.
Large Korean cohorts link moderate kimchi intake with less weight gain and with better blood fats, with different results for men and women. Those are links that cannot show cause. Proper evidence from large, long trials was not found in the sources read.
Kimchi versus a kimchi-derived probiotic
A fermented food is not automatically a probiotic. ISAPP defines fermented foods as foods made through desired microbial growth and enzymatic conversions, and a probiotic as a live microorganism that gives a health benefit when given in adequate amounts. A 2024 review asks whether kimchi deserves the probiotic label; its abstract does not say that it does.
In the one capsule trial, Lactobacillus sakei CJLS03 (a strain taken from kimchi) lowered body fat mass by 0.8 kg versus placebo over 12 weeks in 114 adults, with no change in weight or BMI. That result belongs to that strain as a product, not to kimchi.
At a glance
Traditional uses history, not proof
- Eaten as a staple side dish in Korean cooking
- Long use as food is not proof that it treats any condition
Studied for research
- Blood sugar and insulin resistance, low certainty
- Blood pressure, low certainty
- Cholesterol and blood fats, low certainty
- Body weight and body fat, low certainty
- Gut microbes, very low certainty (lab markers)
- Immune markers, low certainty of no effect in healthy students
- Stomach cancer risk, mixed (observational; pickled vegetables go with higher risk)
- Kimchi-derived probiotic capsule, low certainty (a different product)
Main compounds
- Lactic acid bacteria from fermentation
- Sodium (from salt)
- Vitamin K
- Folate
- Fibre
- Histamine and tyramine (formed in fermentation)
Common forms
- Fresh (1-day-old) and fermented (10-day-old) kimchi, as food (trials)
- Cabbage kimchi and radish kimchi, as food (cohort studies)
- Shop-bought and home-made kimchi differ in salt and ingredients; labels vary
- A capsule of a bacterium taken from kimchi is a different product and is not covered by food results
Research links: 2025 review: kimchi and cardiometabolic markers (5 trials, 4 cohorts) · 2024 outbreak: norovirus in school kimchi · 2020 analysis: pickled vegetables and stomach cancer · Research Library · Genes & Biomarkers Library
What it is and its history
- Accepted scientific name
- Brassica rapa L. (the species of the main ingredient, napa cabbage)
- Naming authority
- L. (GBIF accepted). Kimchi is a prepared dish of fermented vegetables, not a single plant.
- Common names
- Kimchi (English); Kimchee (English); Korean fermented cabbage (English); Kimchi (Spanish)
- Family or group
- Brassicaceae (the mustard or cabbage family), as given by GBIF. Kimchi itself is a prepared food made from several vegetables, not a plant.
- Classification
- Plantae > Tracheophyta > Magnoliopsida > Brassicales > Brassicaceae > Brassica > Brassica rapa
- Native range
- Not verified from a source read.
- Habitat
- Not verified from a source read.
- What it looks like
- Roots: Not verified.; Stems: Not verified.; Leaves: Not verified.; Flowers: Not verified.
- Cultivation
- Not verified from a source read.
- Harvest and processing
- A 2024 lab study lists red pepper, garlic, ginger, green onion and radish as essential kimchi ingredients and sugar and anchovy sauce among optional ones, and found that red pepper and garlic mainly set the levels of organic acids and biogenic amines during 100 days of fermentation. A 2024 review says kimchi ferments on its own, mainly by lactic acid bacteria that come from the raw ingredients. How kimchi is made in detail (salting, rinsing, time and temperature) was not read from a source, and this page gives no recipe.
- Look-alikes and adulterants
- Name: Sauerkraut and other fermented vegetables; Note: Related foods with their own pages; ingredients, salt and bacteria differ.; Name: Vinegar pickles; Note: Pickled in vinegar rather than fermented, so not the same food.; Name: Kimchi-derived probiotic capsules; Note: A capsule of bacteria taken from kimchi is not kimchi.
- Sustainability and conservation
- Not assessed.
Photographs

Traditional use and history history, not clinical proof
| Tradition or era | Documented use | Source |
|---|---|---|
| Korean cuisine | A 2024 review describes kimchi as a traditional Korean fermented vegetable side dish that has become a global health food. No source read gives its date of origin or how it was first made. | Cha J et al., Crit Rev Food Sci Nutr 2024 (PMID 36718547), abstract read |
Traditional use shows how it was used. It does not show that it works or is safe today.
What is inside, and how it may work
What it contains and how those compounds act in cells and animals. Laboratory and animal mechanisms are not proven effects in people.
Main compounds
| Compound | Family | Where it is concentrated | Activity studied | Level of evidence |
|---|---|---|---|---|
| Lactic acid bacteria (Leuconostoc, Weissella, Lactobacillus) | microorganisms | Whole fermented dish About 9 to 10 log colony-forming units per gram (as described in a 2024 review) | These bacteria ferment the vegetables. Whether the bacteria in the food have health effects in people was not shown by the trials read. 3 | Lab |
| Sodium | mineral | Salt used in making USDA: 498 mg per 100 g | High sodium is the main nutrition caution; see Safety. 34 30 | Human data |
| Vitamin K (phylloquinone) | vitamin | Cabbage and other leaves USDA: 43.6 micrograms per 100 g | Matters for people taking warfarin; see Safety. 34 32 | Human data |
| Folate | vitamin | Vegetables USDA: 52 micrograms DFE per 100 g | A nutrient amount from a USDA table. 34 | Human data |
| Histamine and tyramine (biogenic amines) | biogenic amines | Formed during fermentation Histamine above the authors' limit in one cabbage kimchi product; tyramine about half of the limit in most (2024 lab analysis) | Can cause reactions in sensitive people and interact with MAOI antidepressants. 14 23 | Lab |
Mechanisms, receptors and pathways
| Target or pathway | Gene or receptor | What was found | Level |
|---|---|---|---|
| Fermentation by lactic acid bacteria | Not applicable | Kimchi ferments on its own, mainly by lactic acid bacteria from the raw ingredients. In a lab study, kimchi made without red pepper, garlic, ginger, green onion or radish had less lactic acid. 3 15 | Lab |
| Gut microbes and blood gene activity | Not specified in the abstract | In 24 obese women, changes in gut microbes and blood gene activity were linked to the obesity-related changes, more clearly with fermented kimchi. This is a correlation in a small trial, not a shown mechanism. 5 | Human data |
| Tyramine formation | Tyrosine decarboxylase (tdc) gene of Levilactobacillus brevis | Most amine-making bacteria found in kimchi were Levilactobacillus brevis, which made mainly tyramine, and the tdc gene was more active in kimchi inoculated with it. 14 | Lab |
Absorption, metabolism and elimination
- Absorption
- Not found for kimchi nutrients or bacteria in people.
- Distribution
- Not found.
- Metabolism
- Not found.
- Elimination
- Not found.
- Bioavailability
- Not established.
Isolated compounds versus whole extracts
The trials of the food used fresh or fermented kimchi as eaten. The capsule trial used one bacterium taken from kimchi (Lactobacillus sakei CJLS03) as a product. A fermented food is not automatically a probiotic: ISAPP defines fermented foods as foods made through desired microbial growth and enzymatic conversions, and defines a probiotic as a live microorganism that gives a health benefit when given in adequate amounts. A 2024 review looks at whether kimchi deserves the label, and its abstract does not say that it does. NCCIH writes about probiotics, not kimchi.
Nutritional composition
Nutrition from USDA FoodData Central, entry 'Cabbage, kimchi' (FDC 170392, SR Legacy, April 2018 release; values read 2026-10-26 from a saved copy of the USDA tables, because the public API was rate-limited). Per 100 g: 15 kcal, 1.1 g protein, 0.5 g fat (0.067 g saturated), 2.4 g carbohydrate (1.06 g sugars), 1.6 g fibre, 94.3 g water, 498 mg sodium, 151 mg potassium, 33 mg calcium, 2.5 mg iron, 14 mg magnesium, 24 mg phosphorus, 0.22 mg zinc, 52 micrograms folate DFE, 43.6 micrograms vitamin K, 0.213 mg vitamin B6, 0.21 mg riboflavin and 1.1 mg niacin. USDA lists vitamin C as 0 mg and vitamin B12 as 0 in this entry. One typical USDA portion is 1 cup (150 g, the 100 g values multiplied by 1.5): about 23 kcal, 1.7 g protein, 0.8 g fat, 3.6 g carbohydrate, 2.4 g fibre, 747 mg sodium, 227 mg potassium, 50 mg calcium, 3.8 mg iron, 78 micrograms folate DFE and 65 micrograms vitamin K. Sodium in 100 g is about 22% of the 2,300 mg Daily Value (FDA). This is one generic entry; real products differ in salt, sugar, fish sauce and fermentation time, so the label on the pack is the better guide. Fresh and fermented kimchi were not separated in USDA data.
1 high certainty1 mixed findings6 low certainty1 very low certainty
What was looked at
The 9 benefits and uses checked for Kimchi, each with how strong the evidence is. Tap one to open it.
- Nutrient content (low calories, fibre, vitamin K, folate)High certainty
- Blood sugar and insulin resistanceLow certainty
- Blood pressureLow certainty
- Cholesterol and blood fatsLow certainty
- Body weight and body fatLow certainty
- Gut microbesVery low certainty
- Immune markers (no effect in one trial)Low certainty
- Stomach (gastric) cancer riskMixed findings
- A kimchi-derived probiotic capsule (not kimchi)Low certainty
Lab markers tracked in the studies
Fasting blood glucoseInsulin resistanceSystolic blood pressureDiastolic blood pressureTriglyceridesTotal and LDL cholesterolBody weight, BMI and body fatGut microbe makeupImmune cells, inflammation markers and antibodiesStomach cancer (new cases)
What is Kimchi good for?
The main studied uses and how strong the human evidence is for each. Most trials are small, short and from Korea, and the blood sugar, blood pressure, weight and cholesterol trials did not compare kimchi with no kimchi.
Benefits, one by one
Each card is a research question, not a promise. Tap a goal to filter. Open a card to see the studies, doses and limits.
Nutrient content (low calories, fibre, vitamin K, folate)
High certaintyUSDA lists kimchi as low in calories (15 kcal per 100 g) with 1.6 g of fibre, 43.6 micrograms of vitamin K and 52 micrograms of folate per 100 g. It is also salty, at 498 mg of sodium per 100 g.
1 studiesOne USDA entry (FDC 170392, SR Legacy 2018). One cup is 150 g.
Studies, doses and limits
What the trials found
No trial was read showing that eating kimchi corrects a shortfall in any nutrient.
Results
Kimchi is a low-calorie vegetable dish with some fibre, vitamin K, folate and iron on paper, and a high sodium content. Recipes and brands differ.
Effect sizes as reported
USDA entry "Cabbage, kimchi", per 100 g: 15 kcal, 1.1 g protein, 0.5 g fat, 2.4 g carbohydrate (1.06 g sugars), 1.6 g fibre, 498 mg sodium, 151 mg potassium, 33 mg calcium, 2.5 mg iron, 52 micrograms folate DFE, 43.6 micrograms vitamin K.
Why this rating
High that the USDA entry lists these values. It is one generic entry; real products vary, and the table does not say how this sample was made.
Form and dose studied
One USDA entry (FDC 170392, SR Legacy 2018). One cup is 150 g.
Who was studied
General adult diet.
Limits
A nutrient table, not a trial. Vitamin C is listed as 0 mg in this entry, which may reflect how it was measured; it was not checked further. Recipes with more or less salt, fish sauce or sugar will differ.
Why researchers looked
People ask what kimchi gives in nutrients before asking about health effects.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Nutrient database
These are nutrient amounts in the food from a USDA table. They are not an effect in the body.
A proposed mechanism does not show that the effect happens in people.
Kimchi is salty (USDA lists 498 mg of sodium per 100 g); see the Safety tab. Vitamin K matters for people on warfarin; see Safety.
Blood sugar and insulin resistance
Low certaintyIn two small crossover trials, people with overweight or prediabetes who ate fermented kimchi had lower fasting glucose or insulin resistance. A 2025 pooled analysis found fasting glucose about 1.9 mg/dL lower, a result that only just reaches significance.
3 studiesFermented and fresh whole kimchi as food, 4 to 8 weeks. The amount pe…
Studies, doses and limits
What the trials found
In 22 overweight or obese adults, fermented kimchi lowered fasting glucose over 4 weeks, with greater net differences in glucose than fresh kimchi. In 21 adults with prediabetes, fermented kimchi lowered insulin resistance over 8 weeks, and glucose tolerance improved in 33.3% on fermented kimchi versus 9.5% on fresh. A 2025 meta-analysis of five intervention studies (205 people) found fasting glucose 1.93 mg/dL lower.
Results
Small, short signs of lower glucose and insulin resistance. None of the trials had a group eating no kimchi.
Effect sizes as reported
Fasting glucose WMD -1.93 mg/dL (95% CI -3.82 to -0.03; I2 17.4%). Glucose tolerance improved in 33.3% (fermented) versus 9.5% (fresh) in the 21-person trial.
Why this rating
Low: few small, short trials, no kimchi-free control group, and a pooled result whose range almost touches zero. The meta-analysis was supported by a government agency, not industry.
Form and dose studied
Fermented and fresh whole kimchi as food, 4 to 8 weeks. The amount per day is not given in the abstracts.
Who was studied
Adults who were overweight, obese or had prediabetes, mostly in Korea.
Limits
Compared fresh with fermented, not kimchi with none. Short follow-up. Abstracts only.
Why researchers looked
Fermentation changes kimchi, so researchers compared fresh with fermented kimchi in people at risk of diabetes.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Hypothesis
Not shown. Authors of the trials suggest that the ripeness of kimchi may matter, but they did not test why.
A proposed mechanism does not show that the effect happens in people.
Kimchi is salty (USDA lists 498 mg of sodium per 100 g); see the Safety tab.
Blood pressure
Low certaintyTwo small crossover trials found lower blood pressure on fermented kimchi than on fresh. A 2025 pooled analysis found about 3.5 mmHg lower systolic pressure after leaving out some studies. A 12-year cohort found no clear link between kimchi and new high blood pressure.
5 studiesWhole kimchi as food in the trials; usual intake in the cohort.
Studies, doses and limits
What the trials found
In 22 overweight adults, the net difference in blood pressure favoured fermented over fresh kimchi. In 21 adults with prediabetes, blood pressure fell with fermented kimchi. In the 2025 meta-analysis, systolic and diastolic blood pressure were lower by 3.48 and 2.68 mmHg after excluding studies that added to the differences between trials. In 5,932 Korean adults followed for 12 years, there was no significant difference in new high blood pressure across kimchi intake groups.
Results
Small drops in blood pressure in short trials, but these come from a few studies and from a result that depends on leaving some out. Long-term observational data did not show a rise.
Effect sizes as reported
Systolic BP WMD -3.48 mmHg (95% CI -5.95 to -1.01); diastolic -2.68 mmHg (-4.75 to -0.62), both after exclusions. Cohort: no significant difference across intake groups.
Why this rating
Low: few small trials, and the pooled drop appears only after excluding studies. The cohort is observational. A salty food is not an established way to lower blood pressure.
Form and dose studied
Whole kimchi as food in the trials; usual intake in the cohort.
Who was studied
Adults in Korea, some overweight or with prediabetes.
Limits
No trial compared kimchi with no kimchi. Trial results are not proof for people who already have high blood pressure. Abstracts only.
Why researchers looked
Kimchi is high in sodium, so researchers asked whether it raises blood pressure, and whether fermentation changes the picture.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Hypothesis
Not shown.
A proposed mechanism does not show that the effect happens in people.
Kimchi is high in sodium, which the US FDA links to higher risk of high blood pressure. Check labels and ask your clinician if you are watching sodium.
Cholesterol and blood fats
Low certaintyIn a 7-day trial in 100 healthy young adults, total and LDL cholesterol fell in both a low and a high kimchi group. Large Korean cohorts link some amounts of cabbage kimchi to better blood fats, with results that differ for men and women.
4 studiesWhole kimchi as food, 15 g or 210 g a day in the trial; cohort intake…
Studies, doses and limits
What the trials found
In the 7-day dormitory trial (15 g versus 210 g a day), fasting glucose, total cholesterol and LDL fell in both groups, more at the higher intake, and more in people whose cholesterol started high. The 2025 meta-analysis found triglycerides 28.9 mg/dL lower after leaving some studies out. In cohorts, 2 to under 3 servings a day of cabbage kimchi went with smaller rises in total cholesterol, triglycerides and LDL in women (61,761 adults), and 1 to 2 servings with lower risk of high cholesterol in men and of low HDL in women (4,666 adults).
Results
Small improvements in blood fats in a short trial and in cohorts, with different findings in men and women.
Effect sizes as reported
Meta-analysis triglycerides WMD -28.9 mg/dL (95% CI -53.2 to -4.5, after exclusions). HEXA cohort, women: total cholesterol beta -1.600, triglycerides -3.372, LDL -1.155. Ansan-Anseong cohort: HR 0.614 for high cholesterol in men (1 to 2 servings), HR 0.797 for low HDL in women.
Why this rating
Low: a 7-day trial in healthy young people with no kimchi-free group, observational cohorts that cannot prove cause, and sex-specific findings. One cohort was funded by the World Institute of Kimchi.
Form and dose studied
Whole kimchi as food, 15 g or 210 g a day in the trial; cohort intakes are servings a day from a questionnaire.
Who was studied
Healthy young adults (trial); Korean adults aged 40 to 69 (cohorts).
Limits
Short trial. The changes in the cohorts are small. Abstracts only.
Why researchers looked
Vegetable-rich diets are linked to lower cholesterol, so researchers looked at kimchi in particular.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Hypothesis
Not shown.
A proposed mechanism does not show that the effect happens in people.
Kimchi is salty (USDA lists 498 mg of sodium per 100 g); see the Safety tab.
Body weight and body fat
Low certaintyBody weight, BMI and body fat fell in two small crossover trials in overweight people. Large Korean cohorts link moderate kimchi intake with less weight gain, but with a J-shaped pattern, so more is not better.
5 studiesWhole kimchi as food.
Studies, doses and limits
What the trials found
In 22 overweight adults, weight, BMI and body fat fell in both fresh and fermented phases over 4 weeks. In 21 adults with prediabetes, both kinds lowered weight, BMI and waist over 8 weeks. In 115,726 Korean adults, 1 to 3 servings a day went with lower odds of obesity in men (OR 0.875 and 0.893), all with a J-shaped pattern. In 20,066 people with BMI 25 or more, moderate intake went with a higher chance of reaching normal weight in men (HR 1.28). The 2025 review says prospective cohorts linked higher kimchi intake with an increased chance of reaching normal weight.
Results
Small weight changes in short trials with no kimchi-free group, and observational links that cannot show cause.
Effect sizes as reported
Cross-sectional OR 0.875 (1 to 2 servings) and 0.893 (2 to 3 servings) for obesity in men. Cohort HR 1.28 (95% CI 1.06 to 1.54) for normal weight in men with moderate intake.
Why this rating
Low: two small crossover trials without a no-kimchi comparison, and observational studies with food questionnaires. The cross-sectional study found a J-shaped pattern, so more may not be better.
Form and dose studied
Whole kimchi as food.
Who was studied
Overweight or obese Korean adults (trials); Korean adults aged 40 to 69 (cohorts).
Limits
Weight loss in the trials may be due to the study diet and supervision, not kimchi. Abstracts only.
Why researchers looked
Researchers looked at kimchi in people with overweight because of its fibre, low calories and fermentation.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Hypothesis
Not shown.
A proposed mechanism does not show that the effect happens in people.
Kimchi is salty (USDA lists 498 mg of sodium per 100 g); see the Safety tab.
Gut microbes
Very low certaintyA trial in 24 obese women found fresh and fermented kimchi changed gut microbes and blood gene activity differently. These are lab markers, not symptoms or disease.
2 studiesWhole fresh or fermented kimchi as food for 8 weeks.
Studies, doses and limits
What the trials found
Twenty-four obese Korean women ate fresh or fermented kimchi for eight weeks. The authors found different effects on obesity-related measures, with clearer links to gut microbes and blood gene activity in the fermented kimchi group.
Results
A change in laboratory markers. It does not show a better gut or any health result.
Effect sizes as reported
No numbers in the abstract.
Why this rating
Very low: one small trial, marker outcomes only, and no kimchi-free group.
Form and dose studied
Whole fresh or fermented kimchi as food for 8 weeks.
Who was studied
Obese Korean women.
Limits
Marker changes only; abstract only.
Why researchers looked
Kimchi is made by living bacteria, so researchers asked whether it changes the gut.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Correlational
Not shown. The trial reports correlations between microbe changes and blood gene activity.
A proposed mechanism does not show that the effect happens in people.
None specific.
Immune markers (no effect in one trial)
Low certaintyIn 43 healthy students, 4 weeks of kimchi did not change immune cell counts, inflammation markers or antibodies compared with radish.
1 studiesKimchi 100 g a day versus radish 100 g a day, 4 weeks.
Studies, doses and limits
What the trials found
Forty-three healthy Chinese college students ate 100 g of kimchi or 100 g of radish a day for four weeks. No significant changes were seen in lymphocyte subsets, IL-6, TNF-alpha, IL-4, IL-10 or immunoglobulins between groups.
Results
No immune effect was found in healthy young people over 4 weeks.
Effect sizes as reported
No significant differences.
Why this rating
Low that there is no effect in healthy young adults; one small open-label trial. It says nothing about people who are ill.
Form and dose studied
Kimchi 100 g a day versus radish 100 g a day, 4 weeks.
Who was studied
Healthy Chinese college students.
Limits
Small, open-label, short. Abstract only.
Why researchers looked
Fermented foods are often said to boost immunity, so one trial tested it.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Not applicable
Not applicable.
A proposed mechanism does not show that the effect happens in people.
None specific.
Stomach (gastric) cancer risk
Mixed findingsStudies of kimchi and stomach cancer are mixed. A group of studies of pickled vegetables, which includes kimchi, links higher intake with higher stomach cancer risk. The 2025 review reports fewer cancers with higher kimchi intake in prospective cohorts. Researchers suspect salt may play a part.
6 studiesPickled vegetables (including kimchi) and kimchi as eaten.
Studies, doses and limits
What the trials found
A 2020 meta-analysis found a 15% higher risk of stomach cancer for each 40 g a day of pickled vegetables (RR 1.15). A 2010 meta-analysis of Japanese and Korean studies found higher risk with high pickled vegetable intake (OR 1.28) and lower risk with fresh vegetables (OR 0.62). A 2005 Korean case-control study linked kimchi itself to higher risk. A 2021 case-control study mentions that kimchi results are inconsistent. A 2026 commentary calls the kimchi evidence inconsistent and points to sodium and fermentation practice. The 2025 review of kimchi alone says prospective cohorts linked higher intake with lower cancer incidence overall.
Results
The evidence is mixed. Pickled vegetables as a group go with higher stomach cancer risk. Kimchi-only evidence is inconsistent.
Effect sizes as reported
Pickled vegetables: RR 1.15 per 40 g/day (95% CI 1.07 to 1.23); OR 1.28 (1.06 to 1.53) for high intake. Fresh vegetables: OR 0.62 (0.46 to 0.85).
Why this rating
Mixed: all observational, so none can show cause. Pickled vegetables are a wider group than kimchi. Studies are from Korea and Japan. Eating habits and salt differ between people, and old case-control studies depend on remembered diet.
Form and dose studied
Pickled vegetables (including kimchi) and kimchi as eaten.
Who was studied
Adults in Korea and Japan.
Limits
Observational only; kimchi-specific data are limited and inconsistent. Abstracts only.
Why researchers looked
Salted and pickled foods have long been checked for a link to stomach cancer, especially in Korea and Japan.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Speculation
Authors of one 2005 study suggest salt or chemicals increased by fermentation may play a role. This is speculation, not a shown mechanism.
A proposed mechanism does not show that the effect happens in people.
Not a reason to avoid or to eat kimchi on its own. Salt is a plausible link, and sodium is covered on the Safety tab.
A kimchi-derived probiotic capsule (not kimchi)
Low certaintyOne 12-week trial in 114 adults with obesity gave a capsule of Lactobacillus sakei CJLS03, a strain taken from kimchi. Body fat mass changed 0.8 kg more than placebo, but weight and BMI did not change. This tells us about the capsule, not about eating kimchi.
2 studiesCapsule of L. sakei CJLS03 (not kimchi).
Studies, doses and limits
What the trials found
Body fat fell 0.2 kg with the strain and rose 0.6 kg with placebo (difference 0.8 kg, P = 0.018). Waist was 0.8 cm smaller. BMI and weight did not change. Side effects were mild and did not differ from placebo.
Results
A small change in body fat from a single strain in a capsule. It cannot be applied to kimchi.
Effect sizes as reported
Body fat -0.8 kg versus placebo; waist -0.8 cm; weight and BMI unchanged.
Why this rating
Low: one placebo-controlled trial, 12 weeks, one strain. Funding is not stated in the abstract, so industry support is not ruled out.
Form and dose studied
Capsule of L. sakei CJLS03 (not kimchi).
Who was studied
Korean adults with BMI 25 or more.
Limits
One strain, one trial. A kimchi-derived bacterium in a capsule is a different product from the food.
Why researchers looked
Bacteria taken from kimchi were tested as a product, in the hope that they act like kimchi.
Traditional use
Kimchi is a long-standing Korean side dish. Long use as food is not proof that it treats any condition.
Proposed mechanism Hypothesis
Not shown.
A proposed mechanism does not show that the effect happens in people.
Mild side effects only in the abstract. Probiotics carry extra risk for people with serious illness or weakened immunity (NCCIH).
Connections to the rest of health
How Kimchi connects to the rest of our health knowledge graph. Every link says what kind of connection it is. A safety link (for example to the liver) is a warning, not a benefit. A study that merely mentions a topic never creates a benefit link.
Explore every connection: goals, body systems, organs, symptoms, genes
A. Wellness goals
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Preventive Wellness | High certainty | Nutrient content (low calories, fibre, vitamin K, folate): USDA lists kimchi as low in calories (15 kcal per 100 g) with 1.6 g of fibre, 43.6 micrograms of vitamin K and 52 micrograms of folate per 100 g. It is also salty, at 498 mg of sodium per 100 g. | 34 | |
| Blood Sugar Balance | Low certainty | Blood sugar and insulin resistance: In two small crossover trials, people with overweight or prediabetes who ate fermented kimchi had lower fasting glucose or insulin resistance. A 2025 pooled analysis found fasting glucose about 1.9 mg/dL lower, a result that only just reaches significance. | 2 11 1 | |
| Metabolic Health | Low certainty | Blood sugar and insulin resistance: In two small crossover trials, people with overweight or prediabetes who ate fermented kimchi had lower fasting glucose or insulin resistance. A 2025 pooled analysis found fasting glucose about 1.9 mg/dL lower, a result that only just reaches significance. | 2 11 1 | |
| Heart Health | Low certainty | Blood pressure: Two small crossover trials found lower blood pressure on fermented kimchi than on fresh. A 2025 pooled analysis found about 3.5 mmHg lower systolic pressure after leaving out some studies. A 12-year cohort found no clear link between kimchi and new high blood pressure. Cholesterol and blood fats: In a 7-day trial in 100 healthy young adults, total and LDL cholesterol fell in both a low and a high kimchi group. Large Korean cohorts link some amounts of cabbage kimchi to better blood fats, with results that differ for men and women. | 11 2 1 25 30 4 19 20 | |
| Blood Pressure Support | Low certainty | Blood pressure: Two small crossover trials found lower blood pressure on fermented kimchi than on fresh. A 2025 pooled analysis found about 3.5 mmHg lower systolic pressure after leaving out some studies. A 12-year cohort found no clear link between kimchi and new high blood pressure. | 11 2 1 25 30 | |
| Cholesterol Balance | Low certainty | Cholesterol and blood fats: In a 7-day trial in 100 healthy young adults, total and LDL cholesterol fell in both a low and a high kimchi group. Large Korean cohorts link some amounts of cabbage kimchi to better blood fats, with results that differ for men and women. | 4 1 19 20 | |
| Weight Management | Low certainty | Body weight and body fat: Body weight, BMI and body fat fell in two small crossover trials in overweight people. Large Korean cohorts link moderate kimchi intake with less weight gain, but with a J-shaped pattern, so more is not better. | 11 2 9 26 1 | |
| Metabolic Health | Low certainty | Body weight and body fat: Body weight, BMI and body fat fell in two small crossover trials in overweight people. Large Korean cohorts link moderate kimchi intake with less weight gain, but with a J-shaped pattern, so more is not better. | 11 2 9 26 1 | |
| Gut Health | Preliminary mechanism | Very low certainty | Gut microbes: A trial in 24 obese women found fresh and fermented kimchi changed gut microbes and blood gene activity differently. These are lab markers, not symptoms or disease. | 5 3 |
| Digestive Support | Preliminary mechanism | Very low certainty | Gut microbes: A trial in 24 obese women found fresh and fermented kimchi changed gut microbes and blood gene activity differently. These are lab markers, not symptoms or disease. | 5 3 |
| Immune Support | Low certainty | Immune markers (no effect in one trial): In 43 healthy students, 4 weeks of kimchi did not change immune cell counts, inflammation markers or antibodies compared with radish. | 13 | |
| Preventive Wellness | Mixed findings | Stomach (gastric) cancer risk: Studies of kimchi and stomach cancer are mixed. A group of studies of pickled vegetables, which includes kimchi, links higher intake with higher stomach cancer risk. The 2025 review reports fewer cancers with higher kimchi intake in prospective cohorts. Researchers suspect salt may play a part. | 29 10 18 12 28 1 | |
| Weight Management | Low certainty | A kimchi-derived probiotic capsule (not kimchi): One 12-week trial in 114 adults with obesity gave a capsule of Lactobacillus sakei CJLS03, a strain taken from kimchi. Body fat mass changed 0.8 kg more than placebo, but weight and BMI did not change. This tells us about the capsule, not about eating kimchi. | 16 33 |
B. Body systems
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Whole Body | Biological association | High certainty | Studied for: Nutrient content (low calories, fibre, vitamin K, folate) | 34 |
| Blood Sugar Support | Biological association | Low certainty | Studied for: Blood sugar and insulin resistance | 2 11 1 |
| Endocrine System | Biological association | Low certainty | Studied for: Blood sugar and insulin resistance | 2 11 1 |
| Cardiovascular System | Biological association | Low certainty | Studied for: Blood pressure Studied for: Cholesterol and blood fats | 11 2 1 25 30 4 19 20 |
| Metabolism Weight | Biological association | Low certainty | Studied for: Body weight and body fat Studied for: A kimchi-derived probiotic capsule (not kimchi) | 11 2 9 26 1 16 33 |
| Digestive System | Biological association | Very low certainty | Studied for: Gut microbes Studied for: Stomach (gastric) cancer risk | 5 3 29 10 18 12 28 1 |
| Immune System | Biological association | Low certainty | Studied for: Immune markers (no effect in one trial) | 13 |
E. Health conditions
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Foodborne illness | Adverse effect or risk | Documented risk | Norovirus and E. coli outbreaks in Korea have been traced to kimchi. Preparation or compound: Unheated kimchi from contaminated ingredients or handling |
22 7 24 21 |
| High blood pressure | Adverse effect or risk | Documented risk | Kimchi is high in sodium and the FDA links higher sodium with high blood pressure, but a 12-year Korean cohort found no clear link with kimchi itself. Preparation or compound: Sodium in kimchi |
30 25 |
| Stomach cancer | Adverse effect or risk | Preliminary or mixed | Pooled observational studies link higher pickled vegetable intake with higher stomach cancer risk; kimchi-only results are inconsistent. Preparation or compound: Pickled vegetables including kimchi |
29 10 |
I. Biomarkers
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Fasting blood glucose | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 1 4 11 |
| Insulin resistance | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 2 |
| Systolic blood pressure | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 1 11 2 25 |
| Diastolic blood pressure | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 1 |
| Triglycerides | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 1 19 |
| Total and LDL cholesterol | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 4 11 19 |
| Body weight, BMI and body fat | Biological association | Low certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 11 2 26 9 |
| Gut microbe makeup | Biological association | Very low certainty | Measured in trials: changed. A lab change is not the same as a health benefit. | 5 |
| Immune cells, inflammation markers and antibodies | Biological association | Low certainty | Measured in trials: no significant change. A lab change is not the same as a health benefit. | 13 |
| Stomach cancer (new cases) | Biological association | Mixed findings | Measured in trials: mixed. A lab change is not the same as a health benefit. | 29 10 18 28 |
K. Biological pathways
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Sodium | Preliminary mechanism | Human | Kimchi has 498 mg of sodium per 100 g by USDA, and kimchi was the second-largest dish group for sodium in Korean national survey data. | 34 8 |
| Vitamin K | Preliminary mechanism | Human | USDA lists 43.6 micrograms per 100 g, which matters for people on warfarin. | 34 32 |
| Gut microbiota | Preliminary mechanism | Human | Fresh and fermented kimchi had different effects on gut microbes in a small trial; no health benefit was shown from the change. | 5 |
L. Active compounds
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Lactic acid bacteria (Leuconostoc, Weissella, Lactobacillus) | Biological association | Lab | These bacteria ferment the vegetables. Whether the bacteria in the food have health effects in people was not shown by the trials read. Preparation or compound: Whole fermented dish |
3 |
| Sodium | Biological association | Human | High sodium is the main nutrition caution; see Safety. Preparation or compound: Salt used in making |
34 30 |
| Vitamin K (phylloquinone) | Biological association | Human | Matters for people taking warfarin; see Safety. Preparation or compound: Cabbage and other leaves |
34 32 |
| Folate | Biological association | Human | A nutrient amount from a USDA table. Preparation or compound: Vegetables |
34 |
| Histamine and tyramine (biogenic amines) | Biological association | Lab | Can cause reactions in sensitive people and interact with MAOI antidepressants. Preparation or compound: Formed during fermentation |
14 23 |
Each connection is stored with the ingredient, the connected record, the kind of connection, the evidence status, the supporting studies, the preparation or compound involved, and a review date (last reviewed October 26, 2026).
The evidence
The research centre for Kimchi. Every record here was checked against PubMed or the publisher's page; we never list a study we have not verified.
Evidence by outcome
Bars show how many studies we found for each outcome, not how well it works. People are added up across trials only (reviews are not added, to avoid double counting).
How we rate evidence
High certainty
Several well-run trials or reviews agree; further research is unlikely to change the picture much.
Moderate certainty
Good trials point the same way, but some doubt remains.
Low certainty
Small, short or inconsistent trials. The finding could change with better research.
Very low certainty
Very little or very weak human data. Treat as a possibility only.
Mixed findings
Trials or reviews disagree with each other.
Not enough evidence
Not enough human research to say either way.
Evidence against
Good research found no benefit, or found harm.
We take the reviewers' own risk-of-bias and GRADE statements where they exist, and otherwise judge from study size, design, consistency, directness and whether a product matches what is sold. Many publications do not make evidence high. Method note: We started from our earlier kimchi page, re-checked nutrition against saved USDA FoodData Central data, matched the plant name with GBIF, read the health agency pages (FDA, NCCIH, MedlinePlus) and re-read PubMed abstracts for trials, reviews, cohorts and outbreak reports. Only abstracts were read for studies. Items we could not verify are flagged in the research gaps.
Study library: every study we checked 34
| Study | Design | People | Product, dose, length | Result |
|---|---|---|---|---|
| Ahn 2025 Effects of Fermented Kimchi Consumption on Anthropometric and Blood Cardiometabolic Indicators: A Systematic Review and Meta-Analysis of Intervention Studies and Prospective Cohort Studies. Nutr Rev · PMID 39545368 · DOI |
Systematic review meta analysis |
5 intervention studies (205 participants) and 4 prospective cohort studies (42,455 participants) | Fermented kimchi without added ingredients or lactic acid bacteria Whole dish, as food Not pooled Varied · vs Fresh kimchi or lower intake |
Fermented kimchi lowered fasting blood glucose by 1.93 mg/dL. After leaving out studies that added to the differences between trials, it was linked to lower triglycerides (28.9 mg/dL), systolic blood pressure (3.48 mmHg) and diastolic blood pressure (2.68 mmHg). Prospective cohorts linked higher kimchi intake to fewer cancers and less metabolic syndrome and more chance of reaching normal weight. The authors say findings must be read cautiously because there are few studies. Fasting glucose WMD -1.93 mg/dL; triglycerides WMD -28.9 mg/dL; systolic BP WMD -3.48 mmHg; diastolic BP WMD -2.68 mmHg (Glucose -3.82 to -0.03 (I2 17.4%); triglycerides -53.2 to -4.5; systolic -5.95 to -1.01; diastolic -4.75 to -0.62) Methods, limits and fundingOutcomes: Body measures, blood pressure, glucose, blood fats, inflammation markers, new cases of related diseases Limitations: Few and small studies. The glucose result barely excludes zero. The triglyceride and blood pressure results come after excluding some studies, which can favour a result. Only the abstract was read. Funding and conflicts: Grant listed: Rural Development Administration, Republic of Korea (a government agency). No industry funding stated in the abstract. Registration: PROSPERO CRD42024532020 Read: abstract |
| An 2013 Beneficial effects of fresh and fermented kimchi in prediabetic individuals. Ann Nutr Metab · PMID 23969321 · DOI |
Randomised crossover trial |
21 21 adults with prediabetes |
Fresh (1-day-old) and fermented (10-day-old) kimchi Whole dish, as food Amount per day not given in the abstract Two 8-week phases with a 4-week washout · vs Fresh kimchi versus fermented kimchi (no kimchi-free group) |
Both types lowered body weight, BMI and waist circumference. Fermented kimchi also lowered insulin resistance, raised insulin sensitivity, and lowered systolic and diastolic blood pressure. Improved glucose tolerance was seen in 33.3% of people on fermented kimchi and 9.5% on fresh. Insulin-resistance and sensitivity changes p = 0.004 and 0.028 (as written in the abstract) (Not given in the abstract) Methods, limits and fundingOutcomes: Body weight, BMI, waist, insulin resistance and sensitivity, blood pressure, glucose tolerance Limitations: Small (21), short, no kimchi-free group, and the fresh-versus-fermented comparison is within the same people. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Cha 2024 Does kimchi deserve the status of a probiotic food? Crit Rev Food Sci Nutr · PMID 36718547 · DOI |
Narrative review n/a |
Review of studies of kimchi and its lactic acid bacteria | Kimchi and kimchi lactic acid bacteria Whole dish and bacteria |
The review describes kimchi as a traditional Korean fermented vegetable side dish that ferments on its own, mainly by lactic acid bacteria (Leuconostoc, Weissella and Lactobacillus) from its raw ingredients, reaching about 9 to 10 log colony-forming units per gram. It surveys health effects of kimchi and its bacteria. About 9 to 10 log CFU/g of lactic acid bacteria (Not applicable) Methods, limits and fundingOutcomes: Whether kimchi can be called a probiotic food Limitations: A narrative review; the abstract does not say that kimchi meets the definition of a probiotic. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Choi 2013 Kimchi, a fermented vegetable, improves serum lipid profiles in healthy young adults: randomized clinical trial. J Med Food · PMID 23444963 · DOI |
Randomised trial |
100 100 healthy young volunteers housed in a dormitory |
Kimchi at a low or a high daily amount Whole dish, as food 15 g a day (low group) or 210 g a day (high group) 7 days · vs Low kimchi intake versus high kimchi intake (no kimchi-free group) |
Fasting glucose, total cholesterol and LDL cholesterol fell in both groups after 7 days, with larger effects at the higher amount. Fasting glucose was lower in the high group than in the low group (P = .003). Lipid-lowering was stronger in people whose total cholesterol was above 190 mg/dL and LDL above 130 mg/dL. No numbers for the changes in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Fasting blood glucose, total cholesterol, LDL cholesterol Limitations: Only 7 days, healthy young adults, and no group eating no kimchi. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Han 2015 Contrasting effects of fresh and fermented kimchi consumption on gut microbiota composition and gene expression related to metabolic syndrome in obese Korean women. Mol Nutr Food Res · PMID 25688926 · DOI |
Randomised trial |
24 24 obese Korean women |
Fresh kimchi or fermented kimchi Whole dish, as food Amount per day not given in the abstract 8 weeks · vs Fresh kimchi group versus fermented kimchi group (no kimchi-free group) |
Fresh and fermented kimchi had different effects on obesity-related clinical measures. Links between those changes and blood gene expression and gut microbes were clearer in the fermented kimchi group. No numbers in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Obesity-related clinical measures, gut microbe composition (stool), blood gene expression Limitations: Small (24); gut-microbe and gene-expression changes are laboratory markers, not symptoms or disease. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Hill 2014 Expert consensus document. The International Scientific Association for Probiotics and Prebiotics consensus statement on the scope and appropriate use of the term probiotic. Nat Rev Gastroenterol Hepatol · PMID 24912386 · DOI |
Consensus statement n/a |
Expert panel (12 authors) | Probiotics |
The panel reinforced the FAO/WHO definition of probiotics as live microorganisms which, when given in adequate amounts, confer a health benefit on the host. Not applicable (Not applicable) Methods, limits and fundingOutcomes: Definition of a probiotic Limitations: A consensus statement, not a trial. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Hwang 2026 Workplace outbreak of enterotoxigenic Escherichia coli O159 enteritis linked to kimchi consumption in Daejeon, Korea, 2024. Epidemiol Health · PMID 42442735 · DOI |
Outbreak investigation |
77 77 people met the case definition at a workplace; 27 laboratory-confirmed |
Kimchi suspected to carry enterotoxigenic E. coli O159 Commercial kimchi from a factory · vs People who did not eat the kimchi |
Attack rate was higher among kimchi eaters than non-eaters (RR 1.47). The same E. coli pattern was found in patients and in kimchi isolates. The kimchi came from one factory and went to several caterers, causing further outbreaks. The exact point of contamination was not found. Average time from eating to illness was about 70 hours. RR 1.47 (1.08 to 2.00) Methods, limits and fundingOutcomes: Illness and bacterial type in people and kimchi Limitations: Kimchi was suspected, not proven, as the source. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Jeong 2021 Trends in sodium intake and major contributing food groups and dishes in Korea: the Korea National Health and Nutrition Examination Survey 2013-2017. Nutr Res Pract · PMID 34093978 · DOI |
National survey |
Korean national survey (24-hour recalls), 2013 to 2017 | Dietary sodium by food and dish group Dishes as eaten |
Mean sodium intake was 3,477 to 3,890 mg a day. The top three dish groups were noodles and dumplings, kimchi (487 to 540 mg a day) and soups. Cabbage kimchi was a major source in people aged 40 to 59. The authors say cutting soups and kimchi is an effective way to lower sodium intake. Kimchi 487.3 to 539.6 mg sodium a day on average (Not applicable) Methods, limits and fundingOutcomes: Daily sodium intake and which dishes contribute Limitations: A survey of what people reported eating in Korea; it does not show harm from kimchi. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Jung 2024 Association between kimchi consumption and obesity based on BMI and abdominal obesity in Korean adults: a cross-sectional analysis of the Health Examinees study. BMJ Open · PMID 38290970 · DOI |
Cross sectional study |
115726 115,726 Korean adults aged 40 to 69 |
Kimchi as eaten (food frequency questionnaire) Whole dish, as food Servings a day from a questionnaire · vs Under 1 serving a day |
In men, 1 to 3 servings a day of all kimchi went with lower odds of obesity (OR 0.875 for 1 to 2 servings and 0.893 for 2 to 3 servings) than under 1 serving. Men with the highest cabbage-kimchi intake had 10% lower odds of obesity and abdominal obesity. Radish-kimchi intake went with 8% (men) and 11% (women) lower odds of abdominal obesity. All results had a J-shaped pattern, and the authors advise limiting excessive intake. OR 0.875 and 0.893 (men, total kimchi) (Not given in the abstract) Methods, limits and fundingOutcomes: Obesity (BMI 25 or more) and abdominal obesity Limitations: Cross-sectional: cannot show that kimchi causes lower weight. Based on a food questionnaire. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Kim 2010 Fresh and pickled vegetable consumption and gastric cancer in Japanese and Korean populations: a meta-analysis of observational studies. Cancer Sci · PMID 19860848 · DOI |
Systematic review meta analysis |
8 studies of fresh vegetables and 14 studies of pickled vegetables in Japanese and Korean people | Fresh and pickled vegetables (pickled includes salted and fermented types) Vegetables as eaten · vs Lower intake |
High intake of fresh vegetables went with lower gastric cancer risk (summary OR 0.62). High intake of pickled vegetables went with higher risk (summary OR 1.28). The authors suggest that fresh vegetables, rather than a large total including pickled vegetables, matter for lowering risk. Fresh vegetables OR 0.62; pickled vegetables OR 1.28 (Fresh 0.46 to 0.85; pickled 1.06 to 1.53) Methods, limits and fundingOutcomes: Gastric cancer risk Limitations: Observational studies in Japan and Korea; pickled vegetables are a broad group, not kimchi alone. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Kim 2011 Fermented kimchi reduces body weight and improves metabolic parameters in overweight and obese patients. Nutr Res · PMID 21745625 · DOI |
Randomised crossover trial |
22 22 overweight or obese adults (BMI above 25) |
Fresh kimchi and fermented kimchi, each in its own phase Whole dish, as food Amount per day not given in the abstract Two 4-week phases with a 2-week washout · vs Fresh kimchi versus fermented kimchi (no kimchi-free group) |
Body weight, BMI and body fat fell in both phases. Fermented kimchi also lowered waist-hip ratio and fasting glucose. The net differences in blood pressure, percent body fat, fasting glucose and total cholesterol were greater with fermented than with fresh kimchi. Fasting insulin tended to fall. No effect sizes in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Body weight, BMI, body fat, waist-hip ratio, blood pressure, fasting glucose, cholesterol, insulin Limitations: Small (22), short, and no group eating no kimchi, so the part due to kimchi itself cannot be separated from other changes during the trial. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Kwak 2021 Gastric Cancer and the Daily Intake of the Major Dish Groups Contributing to Sodium Intake: A Case-Control Study in Korea. Nutrients · PMID 33921757 · DOI |
Case control |
925 440 gastric cancer cases and 485 controls (307 matched pairs analysed) |
High-sodium dish groups including pickled vegetables such as kimchi Dishes as eaten Not given in the abstract · vs Matched controls |
Higher intake of noodles and dumplings was linked to higher gastric cancer incidence. The abstract notes that results on pickled vegetables such as kimchi are inconsistent across studies and reports no clear pickled-vegetable result. No numbers in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Gastric cancer Limitations: Case-control; no clear kimchi result is stated in the abstract. Funding and conflicts: Grant listed: National Research Foundation of Korea. Read: abstract |
| Lee 2014 Immunomodulatory effects of kimchi in chinese healthy college students: a randomized controlled trial. Clin Nutr Res · PMID 25136537 · DOI |
Randomised open label trial |
43 43 healthy Chinese college students (39 finished) |
Kimchi Whole dish, as food 100 g a day 4 weeks, plus 1 week washout · vs 100 g of radish a day (control) |
No significant changes were seen in lymphocyte subsets, inflammation markers (IL-6, TNF-alpha), IL-4, IL-10 or immunoglobulins between the groups. The authors conclude that short-term kimchi had no immune effect in these students. No significant differences (Not given in the abstract) Methods, limits and fundingOutcomes: Immune cells, inflammation markers and antibodies in blood Limitations: Small, open-label, healthy young people, 4 weeks. A no-effect result for healthy people does not speak for people with illness. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Lee 2024 Determination of biogenic amine-producing lactic acid bacteria in kimchi varieties through in vitro analysis and low temperature fermentation. Food Sci Biotechnol · PMID 39145125 · DOI |
Laboratory analysis n/a |
Three kinds of kimchi products (cabbage, white and young radish kimchi) tested in the lab | Commercial kimchi products Whole dish, as food Fermentation at 4 degrees C |
Histamine above the authors' toxicity limit was found in a single cabbage kimchi product. Tyramine in most cabbage kimchi products was about half of the toxicity limit. Other kinds had lower amounts of biogenic amines. Most of the amine-making bacteria were Levilactobacillus brevis, which made mainly tyramine. No numbers in the abstract (Not applicable) Methods, limits and fundingOutcomes: Histamine and tyramine content and the bacteria that make them Limitations: A laboratory analysis of a small set of products, not a trial and not a report of harm in people. Levels will differ between products. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Lee 2024 Impact of essential and optional ingredients on microbial and metabolic profiles of kimchi. Food Chem X · PMID 38623504 · DOI |
Laboratory study n/a |
Kimchi made in the lab with ingredients left out, over 100 days of fermentation | Kimchi made with or without red pepper, garlic, ginger, green onion, radish, sugar and anchovy sauce Whole dish, as food 100 days of fermentation · vs Kimchi made with all ingredients |
Kimchi made without the essential ingredients (red pepper, garlic, ginger, green onion, radish) had less lactic acid. Red pepper and garlic were the main drivers of organic acids and biogenic amines. Anchovy sauce went with higher levels of some amino acids. The abstract lists anchovy sauce as an optional ingredient. No numbers in the abstract (Not applicable) Methods, limits and fundingOutcomes: Lactic acid, bacteria types, organic acids, biogenic amines and amino acids Limitations: A lab study of how kimchi ferments, not a study in people. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Lim 2020 Effect of Lactobacillus sakei, a Probiotic Derived from Kimchi, on Body Fat in Koreans with Obesity: A Randomized Controlled Study. Endocrinol Metab (Seoul) · PMID 32615727 · DOI |
Randomised placebo controlled trial |
114 114 adults with BMI 25 or more |
Capsule of Lactobacillus sakei CJLS03 (a strain taken from kimchi), not kimchi Probiotic product Two allocations a day of 5 x 10^9 colony-forming units each 12 weeks · vs Placebo (matching vehicle) |
Body fat mass fell 0.2 kg with the strain and rose 0.6 kg with placebo (0.8 kg difference, P = 0.018). Waist was 0.8 cm smaller than placebo (P = 0.013). BMI and body weight did not change. Adverse events were mild and did not differ between groups. Body fat difference 0.8 kg; waist difference 0.8 cm (Not given in the abstract) Methods, limits and fundingOutcomes: Body fat mass, weight, waist circumference, adverse events Limitations: A single strain in a capsule, one trial, 12 weeks. It tells us about that product, not about eating kimchi. Funding not stated in the abstract; an earlier version of this page said a food company supported it, which was not re-checked in the full paper. Funding and conflicts: Funding is not stated in the abstract. The full paper was not read, so industry support is neither confirmed nor ruled out. Registration: ClinicalTrials.gov NCT03248414 Read: abstract |
| Marco 2021 The International Scientific Association for Probiotics and Prebiotics (ISAPP) consensus statement on fermented foods. Nat Rev Gastroenterol Hepatol · PMID 33398112 · DOI |
Consensus statement n/a |
Expert panel (13 authors) | Fermented foods Foods |
The panel defined fermented foods and beverages as foods made through desired microbial growth and enzymatic conversions of food components, and set them apart from probiotics. It also reviewed safety, risks and health benefits. Not applicable (Not applicable) Methods, limits and fundingOutcomes: Definition of fermented foods and their difference from probiotics Limitations: A consensus statement, not a trial. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Nan 2005 Kimchi and soybean pastes are risk factors of gastric cancer. World J Gastroenterol · PMID 15929164 · DOI |
Case control |
1053 421 gastric cancer patients and 632 matched controls in Korea |
Kimchi and soybean paste intake (questionnaire) Whole dish, as food Not given in the abstract · vs Matched controls |
Eating kimchi and soybean pastes was linked to higher gastric cancer risk, while non-fermented alliums and non-fermented seafood were linked to lower risk. The authors suggest salt or chemicals increased by fermentation might play a role. No numbers in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Gastric cancer and gene variants Limitations: A 2005 case-control study that relies on remembered diet; the cause is unknown and the authors' salt idea is speculation. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Oh 2024 Association between traditional Korean fermented vegetables (kimchi) intake and serum lipid profile: using the Korean Genome and Epidemiology Study (KoGES) cohort. Eur J Nutr · PMID 38771355 · DOI |
Prospective cohort |
61761 61,761 Korean adults aged 40 to 69 (Health Examinees cohort) |
Kimchi as eaten (food frequency questionnaire) Whole dish, as food Servings a day from a questionnaire About 5 years between baseline and follow-up · vs Under 1 serving a day of cabbage kimchi |
In women, 2 to under 3 servings a day of cabbage kimchi went with smaller rises in total cholesterol, triglycerides and LDL than under 1 serving. In men, the same intake went with a more positive change in HDL. The authors say interventions are needed to confirm this. Women: total cholesterol beta -1.600; triglycerides -3.372; LDL -1.155 (change in mg/dL versus lowest intake) (Total cholesterol -2.744 to -0.456; triglycerides -5.414 to -1.330; LDL -2.214 to -0.095) Methods, limits and fundingOutcomes: Change in total cholesterol, triglycerides, LDL and HDL Limitations: Observational, changes are small, and results differ by sex. Abstract only. Funding and conflicts: Grants listed: the World Institute of Kimchi and Chung-Ang University. The World Institute of Kimchi is a kimchi-focused institute, so this is a funder with an interest in kimchi. Read: abstract |
| Oh 2026 Association between intake of different types of kimchi and dyslipidemia in Korean adults: a prospective cohort study. Front Nutr · PMID 42266615 · DOI |
Prospective cohort |
4666 4,666 adults in the Ansan-Anseong cohort |
Kimchi as eaten (food frequency questionnaire) Whole dish, as food Servings a day from a questionnaire Follow-up of the cohort (length not given in the abstract) · vs Lowest cabbage-kimchi intake |
In women, the highest cabbage-kimchi group (3 or more servings a day) had a lower risk of low HDL (HR 0.778). Compared with the lowest group, 1 to 2 servings a day of cabbage kimchi went with a lower risk of high cholesterol in men (HR 0.614) and of low HDL in women (HR 0.797). The results differed by sex and by amount. HR 0.778 (women, 3 or more servings); HR 0.614 (men, 1 to 2 servings); HR 0.797 (women, 1 to 2 servings) (0.671 to 0.981; 0.398 to 0.948; 0.649 to 0.979) Methods, limits and fundingOutcomes: New abnormal blood fats (dyslipidemia and four indicators) Limitations: Observational, few significant results among many checked, results differ by sex. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Park 2015 Three gastroenteritis outbreaks in South Korea caused by the consumption of kimchi tainted by norovirus GI.4. Foodborne Pathog Dis · PMID 25764445 · DOI |
Outbreak investigation |
3347 3,347 questionnaires at three schools in Jeonju; 631 cases (attack rate 18.9%) |
Cabbage kimchi tainted with norovirus GI.4 Commercial kimchi · vs Students who did not eat the kimchi |
Kimchi products were significantly linked with illness. Norovirus GI.4 found in patients, in groundwater at the supplier, and in cabbage kimchi was closely matched. The authors linked the outbreaks to kimchi tainted from contaminated groundwater. No numbers beyond the attack rate in the abstract (Not given in the abstract) Methods, limits and fundingOutcomes: Illness and norovirus in people, groundwater and kimchi Limitations: One cluster of outbreaks in 2013. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Park 2025 A large-scale norovirus outbreak associated with kimchi consumption across multiple schools in a Korean city in 2024. Epidemiol Health · PMID 41084188 · DOI |
Outbreak investigation |
4276 4,276 people exposed across 24 schools; 862 cases (attack rate 20.2%) |
Cabbage kimchi products contaminated with norovirus GII.17 Commercial kimchi · vs People who did not eat the kimchi |
Norovirus GII.17 was found in sick people, food handlers without symptoms, and cabbage kimchi products. Eating kimchi was linked to illness (relative risk 3.85) and was confirmed as the source. The authors say contamination likely happened through ingredients or food handlers during manufacture. RR 3.85; OR 5.56 for kimchi in the multivariable analysis (RR 3.12 to 4.74; OR 4.24 to 7.30) Methods, limits and fundingOutcomes: Illness and norovirus in people, food handlers and kimchi Limitations: One outbreak in one city. It shows that unheated kimchi can carry a virus when it is contaminated, not how often this happens. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Saha Turna 2024 A review of biogenic amines in fermented foods: Occurrence and health effects. Heliyon · PMID 38304783 · DOI |
Narrative review n/a |
Review of biogenic amines in fermented foods | Fermented foods in general Fermented foods |
The review says several fermented foods may contain histamine, tyramine or phenylethylamine at levels above documented toxic doses, which are linked to migraines, raised blood pressure and fast heart rate. Harm may occur at levels a hundred times below suggested toxic doses depending on a person's sensitivity, alcohol and certain medicines. Kimchi is not singled out in the abstract. No numbers in the abstract (Not applicable) Methods, limits and fundingOutcomes: Biogenic amines (histamine, tyramine and others) and their health effects Limitations: A review of fermented foods in general. It does not give a result for kimchi in the abstract. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Shin 2016 Consecutive Outbreaks of Enterotoxigenic Escherichia coli O6 in Schools in South Korea Caused by Contamination of Fermented Vegetable Kimchi. Foodborne Pathog Dis · PMID 27557346 · DOI |
Outbreak investigation |
1189 Students in a middle school (2013, 167 cases) and 10 schools (2014, 1,022 cases) |
Cabbage kimchi and young radish kimchi contaminated with enterotoxigenic E. coli O6 Kimchi made at a school restaurant and supplied by a company · vs Students who did not eat the kimchi |
Eating cabbage kimchi and young radish kimchi was linked to illness (adjusted odds ratios 2.62 to 11.74). Enterotoxigenic E. coli O6 was found in 375 patients (33.9%) and in kimchi samples, with matching genetic patterns. Adjusted OR 2.62 to 11.74 (Not given in the abstract) Methods, limits and fundingOutcomes: Diarrhoea illness and E. coli in people and kimchi Limitations: Two outbreaks in Korean schools, 2013 to 2014. Shows that contamination can happen; not how common it is. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Song 2017 High consumption of salt-fermented vegetables and hypertension risk in adults: a 12-year follow-up study. Asia Pac J Clin Nutr · PMID 28582822 · DOI |
Prospective cohort |
5932 5,932 Korean adults (1,798 developed high blood pressure over 12 years) |
Kimchi as eaten (food frequency questionnaire) Whole dish, as food Quintiles of intake from a questionnaire 12 years · vs Lowest intake |
There was no significant difference in the risk of developing high blood pressure across quintiles of total kimchi intake. A rising trend with watery kimchi was seen only in obese men. The authors conclude that high intake of salt-fermented vegetables was not shown to raise the risk of high blood pressure. No significant difference across intake groups (Not given in the abstract) Methods, limits and fundingOutcomes: New high blood pressure Limitations: Observational. A lack of a link here does not show that kimchi has no effect on blood pressure in a given person. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Tan 2023 Effect of kimchi intake on body weight of general community dwellers: a prospective cohort study. Food Funct · PMID 36752575 · DOI |
Prospective cohort |
58290 58,290 Korean adults (20,066 of them with BMI 25 or more for the follow-up analysis) |
Kimchi as eaten (food frequency questionnaire) Whole dish, as food Servings from a questionnaire Follow-up of the Health Examinees cohort (length not given in the abstract) · vs Lower kimchi intake |
Higher kimchi intake went with a smaller rise in BMI. Among men with BMI 25 or more, moderate intake (third quintile) was linked to reaching normal weight (HR 1.28). Cabbage kimchi showed the same pattern in men. Moderate intake, men: HR 1.28 for normal weight (1.06 to 1.54) Methods, limits and fundingOutcomes: BMI change and reaching normal weight Limitations: Observational: people who eat more kimchi may differ in other ways. Food questionnaire. Abstract only. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Van den Eynde 2022 The Prescriber's Guide to the MAOI Diet-Thinking Through Tyramine Troubles. Psychopharmacol Bull · PMID 35721816 · DOI |
Narrative review n/a |
Review for prescribers on diet with classic MAOI antidepressants | Tyramine in food and classic MAOIs Foods in general |
Classic MAOIs alter the body's ability to break down tyramine, which causes dose-related rises in blood pressure. Modern food production has lowered tyramine in most foods, so the risk is lower than it was, but some caution is still advised. Tyramine tables are imprecise because levels vary widely within the same food type. The MAOI diet is described as not very hard, with a small number of risky foods to minimise. No numbers in the abstract (Not applicable) Methods, limits and fundingOutcomes: Dietary precautions with MAOI antidepressants Limitations: A review; it does not name kimchi in the abstract. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Yang 2026 Kimchi friend or foe: preserving cultural foods developed pre-refrigeration. Prev Med Rep · PMID 41560871 · DOI |
Commentary |
Not applicable (commentary on gastric cancer evidence) | Kimchi and its ingredients Whole dish, as food |
The authors say that studies of kimchi and gastric cancer are inconsistent, probably because of differences in sodium content, fermentation practices and overall diet. They propose that lowering the sodium content while keeping traditional fermentation might improve the benefit. No numbers (Not applicable) Methods, limits and fundingOutcomes: Whether kimchi is a risk factor or a protective food for gastric cancer Limitations: A commentary, not a study. Its suggestion that less sodium may help is the authors' proposal, not a tested result. Funding and conflicts: Funding is not stated in the abstract. Read: abstract |
| Yoo 2020 Pickled Vegetable and Salted Fish Intake and the Risk of Gastric Cancer: Two Prospective Cohort Studies and a Meta-Analysis. Cancers (Basel) · PMID 32316595 · DOI |
Cohort studies and meta analysis |
Two Korean cohorts plus earlier prospective cohort studies | Pickled vegetables (a group that includes kimchi) and salted fish Pickled vegetables as eaten Per 40 g a day increase Cohort follow-up · vs Lower intake |
The pooled relative risk of gastric cancer was 1.15 for each 40 g a day increase in pickled vegetables, in a dose-response pattern. For salted fish the highest versus lowest group had a risk 1.17 times higher, which was not clearly significant. The authors say high intake of pickled vegetables and salted fish was linked to higher gastric cancer risk. Pooled RR 1.15 per 40 g/day of pickled vegetables (1.07 to 1.23) Methods, limits and fundingOutcomes: New cases of gastric cancer Limitations: Pickled vegetables are a broad group, not kimchi alone. Observational: it shows a link, not cause. Funding and conflicts: Grant listed: Korean Foundation for Cancer Research. Read: abstract |
| s-fda-sodium US FDA: Sodium in Your Diet · Source |
Health agency n/a |
Methods, limits and fundingRead: full-text | ||
| s-gbif-brassica-rapa GBIF Backbone: Brassica rapa L. (usageKey 7903057) and Brassica rapa subsp. pekinensis (Lour.) Hanelt (usageKey 3042735) · Source |
Reference database n/a |
Methods, limits and fundingRead: full-text | ||
| s-medlineplus-vitk MedlinePlus (US National Library of Medicine): Vitamin K · Source |
Health agency n/a |
Methods, limits and fundingRead: full-text | ||
| s-nccih-probiotics NCCIH (US National Institutes of Health): Probiotics: Usefulness and Safety · Source |
Health agency n/a |
Methods, limits and fundingRead: full-text | ||
| s-usda-fdc-170392 USDA FoodData Central: Cabbage, kimchi (FDC 170392, SR Legacy, April 2018) · Source |
Reference database n/a |
Methods, limits and fundingRead: full-text |
What we do not know yet
- No large, long trial comparing kimchi with no kimchi was found for blood sugar, blood pressure, cholesterol or weight.
- The blood pressure and triglyceride results in the 2025 pooled analysis appear only after some studies were left out; the full paper was not read.
- Evidence on stomach cancer is observational and mixed, and most is for pickled vegetables as a group.
- No kimchi-specific data were found for pregnancy, breastfeeding, children, people with weakened immunity, kidney disease, gout or histamine intolerance.
- Heavy metals, pesticides, mould toxins, fish allergen rules and home fermentation were not researched.
How new research is added
New studies are found by a saved PubMed search and placed in a review queue before the page changes.
Lab markers
What changed in blood or saliva tests during trials. A changed number is not the same as feeling or being healthier, and we give no "normal ranges".
Metabolic 4
Fasting blood glucose
Lowered in trials
The sugar level in the blood after not eating overnight.
Low certaintyResults and what it means
Why it was measured
The usual blood marker for how well the body handles sugar.
Statistical vs. clinical meaning
A very small average fall; the range nearly includes zero.
Safety implication
None specific.
Triglycerides
Lowered in trials
A type of fat in the blood; high levels go with higher heart risk.
Low certaintyResults and what it means
Why it was measured
A common marker of blood fats in diet studies.
Statistical vs. clinical meaning
A change seen after exclusions in trials and in one cohort, with an interest-linked funder on the cohort.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 1 | WMD -28.9 mg/dL (95% CI -53.2 to -4.5) after excluding some studies | Intervention studies in the meta-analysis | Fermented kimchi |
| 19 | Smaller rise in women eating 2 to under 3 servings of cabbage kimchi a day (beta -3.372, 95% CI -5.414 to -1.330) | 61,761 Korean adults, about 5 years | Usual cabbage kimchi intake |
Total and LDL cholesterol
Lowered in trials
Total cholesterol and the 'bad' LDL cholesterol carried in the blood.
Low certaintyResults and what it means
Why it was measured
The usual blood markers for heart risk.
Statistical vs. clinical meaning
Small, short trials; no kimchi-free group.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 4 | Total cholesterol and LDL fell in both groups, more at the higher intake and when levels started high; no numbers in the abstract | 100 healthy young adults, 7 days | Kimchi 15 g or 210 g a day |
| 11 | Net difference in total cholesterol greater with fermented than fresh kimchi | 22 overweight or obese adults, 4 weeks per phase | Fermented versus fresh kimchi |
Body weight, BMI and body fat
Lowered in trials
Measures of body size and the share of fat in the body.
Low certaintyResults and what it means
Why it was measured
Used to see whether diets change weight.
Statistical vs. clinical meaning
Falls in weight happened with and without fermentation, and there was no kimchi-free group.
Safety implication
None specific.
Other 6
Insulin resistance
Lowered in trials
How poorly the body responds to insulin; higher values mean more resistance.
Low certaintyResults and what it means
Why it was measured
A marker of risk for type 2 diabetes in people with prediabetes.
Statistical vs. clinical meaning
One small crossover trial; fresh kimchi did not do the same.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 2 | Fermented kimchi lowered insulin resistance and raised insulin sensitivity (p = 0.004 and 0.028 as written in the abstract) | 21 adults with prediabetes | Fermented kimchi, 8 weeks |
Systolic blood pressure
Lowered in trials
The top number in a blood pressure reading.
Low certaintyResults and what it means
Why it was measured
High blood pressure raises the risk of heart attack and stroke.
Statistical vs. clinical meaning
A small drop after exclusions; the long-term cohort shows no clear link either way.
Safety implication
Kimchi is high in sodium; see Safety.
Diastolic blood pressure
Lowered in trials
The bottom number in a blood pressure reading.
Low certaintyResults and what it means
Why it was measured
Read together with systolic pressure.
Statistical vs. clinical meaning
A small drop that depends on which studies are included.
Safety implication
Kimchi is high in sodium; see Safety.
| Study | Result | People | Product |
|---|---|---|---|
| 1 | WMD -2.68 mmHg (95% CI -4.75 to -0.62) after excluding some studies | Intervention studies in the meta-analysis | Fermented kimchi |
Gut microbe makeup
Changed in trials
The kinds and numbers of bacteria in stool.
Very low certaintyResults and what it means
Why it was measured
A marker of what is happening in the gut.
Statistical vs. clinical meaning
A change in a lab marker with no shown health benefit.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 5 | Fresh and fermented kimchi had different effects; links to blood gene activity were clearer for fermented kimchi | 24 obese Korean women, 8 weeks | Fresh or fermented kimchi |
Immune cells, inflammation markers and antibodies
No significant change in trials
Blood measures of immune cells, IL-6, TNF-alpha, IL-4, IL-10 and immunoglobulins.
Low certaintyResults and what it means
Why it was measured
Checked to see whether kimchi changes immune activity.
Statistical vs. clinical meaning
No effect in a small trial in healthy young people.
Safety implication
None specific.
| Study | Result | People | Product |
|---|---|---|---|
| 13 | No significant changes in lymphocyte subsets, cytokines or immunoglobulins versus radish | 43 healthy students, 4 weeks | Kimchi 100 g a day versus radish 100 g a day |
Stomach cancer (new cases)
Mixed results in trials
New diagnoses of cancer of the stomach.
Mixed findingsResults and what it means
Why it was measured
Salted foods have been checked as a possible risk factor.
Statistical vs. clinical meaning
Linked to higher risk for pickled vegetables as a group; inconsistent for kimchi alone.
Safety implication
Salt content is a likely reason researchers suspect; see Safety for sodium.
| Study | Result | People | Product |
|---|---|---|---|
| 29 | Pooled RR 1.15 (95% CI 1.07 to 1.23) per 40 g/day increase in pickled vegetables | Two Korean cohorts and earlier prospective cohorts | Pickled vegetables, including kimchi |
| 10 | Pickled vegetables OR 1.28 (1.06 to 1.53); fresh vegetables OR 0.62 (0.46 to 0.85) | 22 observational studies in Japan and Korea | Pickled and fresh vegetables |
Safety
What studies and official sources say about side effects, medicines and who should check first. Each point shows what kind of evidence it comes from.
Main points to know 5
- Unheated kimchi has caused food poisoning outbreaks. Four outbreak reports from Korea traced stomach illness to kimchi that carried norovirus or a disease-causing E. coli. The 2024 school outbreak made 862 of 4,276 exposed people ill (20.2%). Kimchi is usually eaten without cooking, so any germ that gets in at the factory, the kitchen or from a food handler stays in. The risk is from contamination, not from fermentation itself. Outbreak investigation 22 7 24 21
- Kimchi is high in sodium. USDA lists 498 mg of sodium in 100 g of kimchi, and one cup (150 g) is about 747 mg. The US FDA says adults should keep sodium under 2,300 mg a day, with lower limits for children under 14, and that diets higher in sodium go with a higher risk of high blood pressure. In Korea, kimchi is the second-largest dish group for sodium in national survey data. Check the Nutrition Facts label, which differs a lot between products. Authoritative guidance 34 30 8
- Pickled vegetables, including kimchi, are linked to stomach cancer in observational studies. A 2020 pooled analysis found 15% higher stomach cancer risk for each 40 g a day of pickled vegetables (RR 1.15). A 2010 pooled analysis of Japanese and Korean studies found higher risk with high pickled vegetable intake (OR 1.28). Results for kimchi alone are inconsistent, and a 2026 commentary points to salt. These are links, not proof of cause. Observational 29 10 18 28
- Histamine and tyramine can build up in fermented foods. A 2024 review says several fermented foods can contain histamine and tyramine at levels linked to migraines, raised blood pressure and fast heart rate, and that some people react at much lower levels. A 2024 lab analysis found histamine above the authors' toxicity limit in one cabbage kimchi product and tyramine at about half of the limit in most. If you take an MAOI antidepressant or react to fermented foods, ask your prescriber or pharmacist. Laboratory analysis and review 23 14 27
- Vitamin K and warfarin. USDA lists 43.6 micrograms of vitamin K per 100 g of kimchi. MedlinePlus says people taking warfarin should keep their vitamin K intake steady from day to day. It does not name kimchi, and no kimchi study was found. Ask your clinic how kimchi fits your own diet. Authoritative guidance 34 32
Side effects 3
| Effect | How often | Severity and recovery | Evidence |
|---|---|---|---|
| Gastroenteritis (vomiting, diarrhoea) from norovirus or disease-causing E. coli in contaminated kimchi These are outbreaks in Korea. They show that contamination happens, not how common it is. | Attack rates in the outbreaks read: 20.2% (862 of 4,276, norovirus GII.17, 24 schools, 2024) and 18.9% (631 of 3,347, norovirus GI.4, 3 schools, 2013). One workplace E. coli outbreak had 77 cases; kimchi eaters were 1.47 times as likely to fall ill (RR 1.47, 95% CI 1.08 to 2.00). How often store-bought or home kimchi is contaminated was not found. | usually self-limiting, but can be severe in some people Not described in the abstracts read. | Outbreak investigation 22 7 24 21 |
| Headache, raised blood pressure or fast heart rate from biogenic amines (histamine, tyramine) in sensitive people Kimchi is not singled out in the review abstract. The lab analysis found one of the cabbage kimchi products tested had histamine above the authors' limit. | Not found for kimchi. The 2024 review says reactions may occur at levels a hundred times below suggested toxic doses in sensitive people, alcohol drinkers or people on certain medicines. | mild to serious (blood pressure rise with MAOIs) Not described. | Review and laboratory analysis 23 14 |
| High sodium intake, which goes with higher risk of high blood pressure A 12-year cohort of 5,932 Korean adults found no significant link between kimchi intake and new high blood pressure. | Kimchi supplied 487 to 540 mg of sodium a day on average in Korean national survey data from 2013 to 2017, out of a mean total of about 3,477 to 3,890 mg. | depends on total diet Not described. | Authoritative guidance and survey 30 8 |
Liver
No liver injury from eating kimchi was found in the sources read. A liver-safety source (such as LiverTox) was not checked.
How often. No frequency was found.
Monitoring. No agency monitoring advice was found.
This is a safety connection. It is not evidence that Kimchi supports liver health.
Medicines and supplements 3
| With | Why it matters | Importance | Evidence | What to do |
|---|---|---|---|---|
| MAOI antidepressants (phenelzine, tranylcypromine, isocarboxazid) and high-dose selegiline prescription | MAOIs alter how the body breaks down tyramine, which causes dose-related rises in blood pressure. A 2024 lab analysis found tyramine in cabbage kimchi products at about half of the authors' toxicity limit, and a 2024 review says tyramine and histamine can build up in fermented foods. | A 2022 review for prescribers says the risk from modern food is lower than it was, that tyramine tables are imprecise because levels vary widely within a food type, and that only a small number of risky foods need to be minimised. Kimchi is not named in the abstracts read. | Laboratory analysis and expert review Very low certainty 27 23 14 | Ask your prescriber or pharmacist about fermented foods such as kimchi. Do not change medicines on your own. |
| Warfarin (a blood thinner) prescription | Vitamin K in food can change how warfarin works. USDA lists 43.6 micrograms of vitamin K per 100 g of kimchi. | MedlinePlus says to keep vitamin K intake steady from day to day because sudden changes can change the medicine's effect. It does not name kimchi, and no kimchi study was found. | Authoritative guidance Low certainty 34 32 | Tell your anticoagulant clinic if you eat kimchi often or are about to change your usual diet. Do not change your medicine yourself. |
| Medicines for blood pressure, kidney or heart disease (sodium load) prescription | Kimchi adds sodium to the diet. No source read describes a specific medicine interaction. | Not established. The FDA says diets higher in sodium go with higher risk of high blood pressure. | Authoritative guidance Very low certainty 30 | If you were told to follow a low-sodium diet, ask your clinician how kimchi fits. |
Who should check first 7
| Situation | Advice | Evidence |
|---|---|---|
| Taking an MAOI antidepressant | Ask your prescriber or pharmacist about kimchi and other fermented foods before eating them. | Expert review 27 23 |
| Taking warfarin | Keep the amount of vitamin K-rich food steady and tell your clinic about regular kimchi. | Authoritative guidance 32 34 |
| Severe illness or weakened immune system | NCCIH says the risk of harm from probiotics is greater in people with severe illness or weakened immunity. It writes about probiotics, not kimchi, and no kimchi-specific data on this were found. Because kimchi is eaten unheated and outbreaks have occurred, ask your care team about unheated fermented foods. | Authoritative guidance 33 22 |
| Pregnancy or breastfeeding | No official statement about kimchi in pregnancy or breastfeeding was found in the sources read. Because kimchi is usually eaten unheated and food-poisoning outbreaks have been reported, ask your midwife, doctor or dietitian about your own diet. | No source found 22 7 |
| Children | The FDA says recommended sodium limits are lower for children under 14. No kimchi-specific advice for children was found. Kimchi can be spicy; spice level was not researched. | Authoritative guidance 30 |
| Allergy to fish or shellfish, or other ingredient allergies | Recipes differ. A 2024 lab study lists anchovy sauce as an optional kimchi ingredient. Read the ingredient label or ask the cook. Allergen rules for kimchi were not looked up for this page. | Ingredient caution 15 |
| Reaction to histamine or tyramine (for example migraines triggered by fermented foods) | Fermented foods can contain these amines. Ask your clinician whether kimchi is suitable for you. | Review 23 |
Overdose, product quality and regulators
Summary. No toxicity from ordinary kimchi as food was found in the sources read apart from contamination outbreaks, sodium and amines.
Animal. Not reviewed.
Human doses studied. This is a food page and gives no amounts. In the 7-day dormitory trial, 15 g or 210 g a day were eaten; the abstract does not mention adverse effects. The other trial abstracts did not report adverse effects either, which is not proof that there were none.
High dose or long term signals. In a cross-sectional study of 115,726 Korean adults, the link with lower obesity was J-shaped and the authors advise limiting excessive intake. In pickled-vegetable studies, higher intake went with higher stomach cancer risk.
Overdose response. Not found.
Genotoxicity. Not researched.
Kimchi is eaten unheated, so germs that get in during making, distribution or serving are not killed. Reports from Korea link kimchi to norovirus and E. coli outbreaks. Pesticide, heavy metal and mould toxin levels were not researched.
Norovirus GII.17 in school kimchi (2024). 862 cases among 4,276 exposed people in 24 schools. Norovirus was found in sick people, symptom-free food handlers and cabbage kimchi products. Kimchi eating went with illness (RR 3.85). The authors say contamination likely happened through ingredients or food handlers during manufacture. 22
Enterotoxigenic E. coli O159 at a workplace (2024). 77 cases; the same genetic pattern was found in patients and kimchi from one factory that supplied several caterers. The exact contamination point was not found. The authors call it rare evidence of unheated fermented foods carrying this E. coli. 7
Enterotoxigenic E. coli O6 in schools (2013 and 2014). 167 and 1,022 students fell ill. E. coli O6 was found in 375 patients and in kimchi samples with matching patterns. In one outbreak the kimchi was made in the school kitchen. 24
Norovirus GI.4 from groundwater (2013). 631 cases among 3,347 students at three schools. Matching norovirus was found in patients, groundwater at the supplier and cabbage kimchi. The authors recommend chlorine disinfection when groundwater is used. 21
Histamine and tyramine in kimchi products. Histamine was above the authors' toxicity limit in one cabbage kimchi product; tyramine in most cabbage kimchi products was about half of the limit. 14
| Body | Action | Date |
|---|---|---|
| US FDA (United States) | Sodium in Your Diet: the Dietary Guidelines for Americans recommend adults limit sodium to under 2,300 mg a day, with lower limits for children under 14. Diets higher in sodium go with higher risk of high blood pressure. Does not name kimchi. source | 2024-03-05 |
| NCCIH (US National Institutes of Health) (United States) | Probiotics: Usefulness and Safety. Risk of harm from probiotics is greater in people with severe illness or weakened immune systems. About probiotics, not kimchi. source | 2019-08 |
| MedlinePlus (US National Library of Medicine) (United States) | Vitamin K: people on warfarin should keep vitamin K intake steady. Does not name kimchi. source | 2025-01-21 |
When to get medical help
- Severe or bloody diarrhoea, repeated vomiting, a high fever, or signs of dehydration (very dry mouth, little urine, dizziness) after eating kimchi: seek medical care.
- Severe headache, a pounding heartbeat, chest pain or confusion after eating kimchi while taking an MAOI antidepressant (possible dangerous rise in blood pressure): seek urgent medical help.
- Trouble breathing, swelling of the lips, face or throat, widespread hives or collapse after eating kimchi (possible severe allergy, for example to fish sauce): use epinephrine if prescribed, then call 911 or your local emergency number.
Stop using the product and contact a clinician or emergency service. In the US, Poison Control is 1-800-222-1222.
General information only, not medical advice. Ask a clinician or pharmacist before use, especially with medicines, in pregnancy or with a health condition. See the Natural Remedy Safety guide.
Frequently asked questions
What is kimchi?
Is kimchi a probiotic?
Does kimchi help with blood sugar?
Small crossover trials found lower fasting glucose or insulin resistance with fermented kimchi in people with overweight or prediabetes. A 2025 pooled analysis found fasting glucose about 1.9 mg/dL lower, a result that barely excludes zero. No trial had a kimchi-free group, so we cannot say how much was due to kimchi.
Does kimchi lower blood pressure?
Does kimchi help with weight?
Does kimchi lower cholesterol?
Is kimchi high in sodium?
Can kimchi cause food poisoning?
Is kimchi linked to stomach cancer?
Can people on MAOI medicines eat kimchi?
Does kimchi affect warfarin?
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Editorial transparency
- Written by
- AlternativeMed editorial team. Research compiled with AI assistance, then checked against the sources listed.
- Medical review
- None. This page has not been reviewed by a physician or pharmacist.
- First published
- 2026-10-26
- Last substantive update
- 2026-10-26
- How we research
- We started from our earlier kimchi page, re-checked nutrition against saved USDA FoodData Central data, matched the plant name with GBIF, read the health agency pages (FDA, NCCIH, MedlinePlus) and re-read PubMed abstracts for trials, reviews, cohorts and outbreak reports. Only abstracts were read for studies. Items we could not verify are flagged in the research gaps.
- How we rate evidence
- See "How we rate evidence" in the Evidence tab.
- Independence
- No product is promoted on this page. No affiliate links are shown. One cohort cited was funded by the World Institute of Kimchi, a kimchi-focused institute; this is stated where it is used. Funding of the kimchi-derived capsule trial is not stated in its abstract.
Sources 34
Each source was opened and checked. Where we read only the abstract, it says so. The small numbers in the text point here.
- Ahn S, Darooghegi Mofrad M, Nosal BM, Chun OK, et al.. Effects of Fermented Kimchi Consumption on Anthropometric and Blood Cardiometabolic Indicators: A Systematic Review and Meta-Analysis of Intervention Studies and Prospective Cohort Studies.. Nutr Rev. 2025. PMID 39545368. DOI 10.1093/nutrit/nuae167. (abstract)
- An SY, Lee MS, Jeon JY, Ha ES, et al.. Beneficial effects of fresh and fermented kimchi in prediabetic individuals.. Ann Nutr Metab. 2013. PMID 23969321. DOI 10.1159/000353583. (abstract)
- Cha J, Kim YB, Park SE, Lee SH, et al.. Does kimchi deserve the status of a probiotic food?. Crit Rev Food Sci Nutr. 2024. PMID 36718547. DOI 10.1080/10408398.2023.2170319. (abstract)
- Choi IH, Noh JS, Han JS, Kim HJ, et al.. Kimchi, a fermented vegetable, improves serum lipid profiles in healthy young adults: randomized clinical trial.. J Med Food. 2013. PMID 23444963. DOI 10.1089/jmf.2012.2563. (abstract)
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- . US FDA: Sodium in Your Diet. . . (full-text)
- . GBIF Backbone: Brassica rapa L. (usageKey 7903057) and Brassica rapa subsp. pekinensis (Lour.) Hanelt (usageKey 3042735). . . (full-text)
- . MedlinePlus (US National Library of Medicine): Vitamin K. . . (full-text)
- . NCCIH (US National Institutes of Health): Probiotics: Usefulness and Safety. . . (full-text)
- . USDA FoodData Central: Cabbage, kimchi (FDC 170392, SR Legacy, April 2018). . . (full-text)