Vitamins & Supplements · Collagen
Marine Collagen (Fish)
Hydrolysed type I collagen from fish · also called Fish collagen, fish collagen peptides, colágeno marino, colágeno de pescado
Marine collagen is a protein made from fish skin, scales and bones, usually sold as small collagen peptides in powders, drinks and gummies. Trials of collagen from all sources found small gains in skin hydration and elasticity over about 12 weeks, but fish-only trials are few and small. The main caution: fish collagen is a recognised allergen and has caused anaphylaxis in people with fish allergy.
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 Marine Collagen (Fish)
Marine collagen is a protein from fish skin and scales. Trials show small skin gains with low certainty, and almost nothing is proven for bones. Fish allergy is the key risk.
What marine collagen is
Marine collagen is collagen taken from fish skin, scales and bones. A 2026 review says it comes from fish processing wastes. It is usually broken into small pieces called peptides (hydrolysed) so it dissolves in drinks. The main collagen in fish skin is type I, made of alpha-1 and alpha-2 chains.
Fish gelatin is also made from fish skin and is type I collagen, so it can carry the same allergen. Collagen from cows, pigs or chickens is a different product.
Fish allergy comes first
Fish collagen is a recognised fish allergen. A 9-year-old girl had anaphylaxis after two gummy tablets containing fish collagen, confirmed by an oral challenge. In blood tests of fish-allergic people, 21 of 101 had IgE to fish collagen in one study, and 38.9% were sensitised to salmon collagen in another of 103. Collagen from one fish cross-reacted with 22 species in a Japanese study.
Heating does not reliably remove the problem, and a test that looks only for parvalbumin can miss a collagen allergy. People with fish allergy should ask an allergist before any product that may contain fish collagen or fish gelatin.
What the research shows
For skin, pooled analyses of hydrolysed collagen from mixed sources found better hydration and elasticity than placebo, and a 2026 review counted benefit in most trials. It also rated most trials high risk of bias. Fish-only trials are small, last 12 weeks and several test branded or combination products, so certainty for marine collagen is low.
For knee osteoarthritis, a 2025 pooled analysis found lower pain and better function with collagen of unspecified source. For bone, only a narrative review with no numbers was found. For rheumatoid arthritis, the evidence is about a different collagen and is poor quality.
Food versus pills
Trial results are for hydrolysed collagen products, not for eating fish. No collagen amounts per portion of fish skin or fish foods were found, and no trial compared fish foods with pills. This page gives no amounts to take; if you wonder about your own needs, ask a doctor, pharmacist or dietitian.
At a glance
Traditional uses history, not proof
- A by-product of fish processing turned into a supplement
- Sold for skin, joints and bones
Studied for research
- Skin hydration, elasticity and wrinkles, low certainty
- Knee osteoarthritis pain (collagen of any source), low certainty
- Bone density, insufficient evidence
- Rheumatoid arthritis, insufficient evidence
Main compounds
- Type I collagen (alpha-1 and alpha-2 chains)
- Collagen peptides (hydrolysate)
- Fish gelatin
Common forms
- Powders, drinks and gummies
- Fish gelatin in foods and capsules
- Fish skin and scales as the raw material
Research links: 2023 review: oral collagen for skin anti-aging (26 trials) · 2021 trial: freshwater fish collagen, wrinkles and elasticity · 2024 trial: fish skin collagen drink, photo-aged skin · 2020 case: anaphylaxis from gummies with fish collagen · 2020 study: collagen as a fish allergen (101 patients) · Research Library · Genes & Biomarkers Library
What it is and its history
- Accepted scientific name
- Marine collagen (hydrolysed collagen from fish skin, scales and bones; mainly type I)
- Common names
- Marine collagen (English); Fish collagen (English); Fish collagen peptides (English); Colágeno marino (Spanish); Colágeno de pescado (Spanish)
- Family or group
- Structural protein. Type I collagen from fish has alpha-1 and alpha-2 chains (2020 allergy study).
- Harvest and processing
- A 2026 review says fish collagen hydrolysates come from fish processing wastes. Details of extraction were not read.
- Look-alikes and adulterants
- Name: Fish gelatin; Note: Made from fish skin and type I collagen. It can carry the same allergen as marine collagen.; Name: Cow, pig or chicken collagen; Note: Other animal collagens; a small laboratory study found little cross-reaction between fish and cow gelatin.; Name: Fish oil; Note: A fat from fish, not a protein; it has its own page.
- Sustainability and conservation
- Not assessed.
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 |
|---|---|---|---|---|
| Type I collagen (alpha-1 and alpha-2 chains) | structural protein | Fish skin and muscle Not read from a source. | The main collagen in fish skin; recognised as an allergen (Lat c 6, Sal s 6). 10 16 | Human data |
| Collagen peptides (hydrolysate) | protein fragments | Fish skin and scales Not read from a source. | The form used in supplement trials. 13 6 | Human data |
| Fish gelatin | processed collagen | Fish skin Not read from a source. | IgE found in some fish-allergic patients; little cross-reaction with cow gelatin. 16 | Human data |
Mechanisms, receptors and pathways
| Target or pathway | Gene or receptor | What was found | Level |
|---|---|---|---|
| IgE binding to fish collagen | IgE antibodies | Collagen caused IgE cross-linking in a rat cell line test and in a human blood cell test (one patient), and another study showed collagen triggering IgE cross-linking on mast cells. 10 11 | Human data |
| Skin cells and oxidative stress | Not specified | A review and a company study describe antioxidant and anti-inflammatory effects in cell and animal tests. This is lab and animal evidence. 15 8 | Lab animal |
| Bone cells | Bone-building and bone-removing cell markers (per review) | A 2026 review reports effects on bone cell markers in cell and animal studies. Lab and animal evidence only. 2 | Lab animal |
Absorption, metabolism and elimination
- Absorption
- Not measured in the abstracts read. A 2026 review states fish collagen peptides have high bioavailability, a claim the abstract does not test.
- Distribution
- Not read.
- Metabolism
- Not read.
- Elimination
- Not read.
- Bioavailability
- Not read from a trial.
Isolated compounds versus whole extracts
Eating fish and taking a collagen supplement are different. Trials here use hydrolysed collagen from fish skin or scales. Fish meat also carries other allergens such as parvalbumin; cooking changes allergen content but does not reliably remove collagen allergy. No trial compared fish foods with collagen pills.
Nutritional composition
Collagen is a protein. No USDA or NIH ODS values for collagen per portion of fish skin, scales or bone were read, so none is given.
2 low certainty3 not enough evidence
What was looked at
The 5 benefits and uses checked for Marine Collagen (Fish), each with how strong the evidence is. Tap one to open it.
- Skin hydration, elasticity and wrinklesLow certainty
- Knee osteoarthritis pain and functionLow certainty
- Bone density and osteoporosisNot enough evidence
- Rheumatoid arthritisNot enough evidence
- Where marine collagen comes fromNot enough evidence
Lab markers tracked in the studies
Skin hydrationSkin elasticityKnee pain and function scoresBone mineral density
What is Marine Collagen (Fish) good for?
The main studied uses and how strong the human evidence is for each. Most skin results are for collagen from several sources, and fish-only trials are few.
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.
Skin hydration, elasticity and wrinkles
Low certaintyTrials of hydrolysed collagen, some of it from fish, found small gains in skin hydration and elasticity in middle-aged adults over about 12 weeks. Three recent reviews of collagen from all sources found more benefit than placebo in most trials, but most trials were rated high risk of bias and fish collagen is not separated out. Trials of fish collagen alone are few, short and small.
8 studiesStudied forms: hydrolysed (broken-down) collagen peptides, mostly by …
Studies, doses and limits
What the trials found
Pooled analyses of hydrolysed collagen from mixed sources: 26 trials with 1,721 people (2023) found better hydration and elasticity than placebo, and 19 trials with 1,125 people (2021, 95% women) found better hydration, elasticity and wrinkles. A 2026 review of 25 trials counted hydration better in 10 of 15 trials, elasticity in 10 of 13 and wrinkles in 9 of 10, and rated most trials high risk of bias. Fish-collagen trials: a 12-week trial of freshwater fish collagen in women aged 45 to 60 reported fewer wrinkles and better elasticity in some groups (some results were against the women's own start, not placebo). A 12-week trial of a fish skin collagen drink in 85 adults with sun-aged skin found better hydration, crow's feet and roughness than placebo. A fish collagen plus GABA jelly trial in 100 adults reported about 20% more hydration and 15% less wrinkle depth, but that product has more than collagen in it and the abstract reads as promotional. The 2023 pooled analysis found no significant difference between collagen sources for elasticity; hydration results varied by source.
Results
Probably a small improvement in skin measurements after about 3 months, mostly studied in women. It is not shown that fish collagen is better or worse than other collagen, and it does not replace sun protection. No trial read reported whether a benefit lasts after stopping.
Effect sizes as reported
Direction and counts, not one number. Fish-specific trials report changes of roughly 10% to 35% on some measures; the abstracts mix comparisons with the group's own start and with placebo.
Why this rating
Pooled results from all collagen sources lean positive, but most trials were high risk of bias and several were short or small. Trials of fish collagen specifically are few and some are tied to makers. Rated low for marine collagen.
Form and dose studied
Studied forms: hydrolysed (broken-down) collagen peptides, mostly by mouth for 12 weeks; trial amounts appear in the studies table only.
Who was studied
Mostly women aged 35 to 60, healthy or with sun-aged skin. Not studied well in men, younger people or people with skin diseases.
Limits
Trials differ in product, amount and measuring method. Some changes are against the group's own start, not placebo. Branded and combination products blur which ingredient did what.
Why researchers looked
People buy marine collagen mainly hoping for firmer, smoother skin as they age.
Traditional use
Marine collagen is a protein from fish skin, scales and bones. Claims that it helps skin or joints are modern supplement marketing; what matters here is what trials found.
Proposed mechanism Hypothesis
The abstracts read do not show how collagen would work in the skin of people. Reviews describe cell and animal findings only.
A proposed mechanism does not show that the effect happens in people.
No side effects were reported in these trials, but they are short. Fish allergy is a real risk; see the Safety tab.
Knee osteoarthritis pain and function
Low certaintyA 2025 pooled analysis of 11 trials (870 people) of collagen supplements in knee osteoarthritis found lower pain and better function scores than placebo. The abstract does not say which collagen types or sources were used, so it cannot be credited to marine collagen. Results differed a lot between trials.
2 studiesOral collagen-based supplements of unspecified source in the pooled a…
Studies, doses and limits
What the trials found
The 2025 meta-analysis of 11 randomised trials found function scores lower (better) by a mean of 6.46 points and pain scores lower by 13.63 points than with placebo, with very large differences between trials (I2 75% and 88%). A 2022 review of rheumatoid arthritis and osteoarthritis studies could not decide whether collagen helps or harms: several studies reported high adverse effects and low efficacy compared with usual treatments, and most were poor quality.
Results
Possibly some pain relief in knee osteoarthritis from collagen supplements in general; certainty is low and marine collagen is not separated out. Not a treatment for arthritis.
Effect sizes as reported
Function MD -6.46 (95% CI -9.52 to -3.40); pain MD -13.63 (95% CI -20.67 to -6.58). I2 75% and 88%.
Why this rating
Pooled benefit but very high differences between trials and no breakdown by collagen source; a second review called the evidence poor quality. Fish collagen alone was not shown.
Form and dose studied
Oral collagen-based supplements of unspecified source in the pooled analysis.
Who was studied
Adults with knee osteoarthritis.
Limits
Source of collagen not stated in the abstract; high differences between trials; trial quality mixed.
Why researchers looked
Collagen is part of cartilage, so supplement makers target joint pain.
Traditional use
Marine collagen is a protein from fish skin, scales and bones. Claims that it helps skin or joints are modern supplement marketing; what matters here is what trials found.
Proposed mechanism Hypothesis
The abstract gives no mechanism for how a collagen supplement might ease knee pain.
A proposed mechanism does not show that the effect happens in people.
Do not stop prescribed arthritis medicines for a supplement. Ask your doctor. Fish allergy applies; see the Safety tab.
Bone density and osteoporosis
Not enough evidenceA 2026 narrative review says early human trials of fish collagen hydrolysates suggest benefits for bone turnover and bone density, but large, well-run trials are still needed. Most of the evidence it covers is from cells and animals.
1 studiesFish collagen hydrolysates; amounts not in the abstract.
Studies, doses and limits
What the trials found
The only source read was one narrative review abstract. It does not list the human trials, their size, or any numbers. No randomised trial of fish collagen on bone density was opened.
Results
Not enough human evidence to say fish collagen helps bone. It is not a replacement for bone medicines.
Effect sizes as reported
No numbers in the abstract.
Why this rating
A narrative review with early signals, no numbers and mostly lab and animal evidence. No human trial was read.
Form and dose studied
Fish collagen hydrolysates; amounts not in the abstract.
Limits
Review abstract only; no trial data seen.
Why researchers looked
Bone is rich in collagen, so researchers test whether collagen peptides help bone.
Traditional use
Marine collagen is a protein from fish skin, scales and bones. Claims that it helps skin or joints are modern supplement marketing; what matters here is what trials found.
Proposed mechanism Lab animal
Cell and animal studies reviewed in 2026 report effects on bone-building and bone-removing cell markers. This is lab and animal evidence.
A proposed mechanism does not show that the effect happens in people.
No bone-specific safety information was read; see the Safety tab for fish allergy.
Rheumatoid arthritis
Not enough evidenceA 2022 review of 10 rheumatoid arthritis studies, all of intact type II collagen (not fish skin collagen), could not decide whether collagen helps or harms. Several included studies reported high adverse effects and low efficacy compared with usual treatments.
1 studiesIntact type II collagen in the rheumatoid studies; not hydrolysed fis…
Studies, doses and limits
What the trials found
The review included 19 articles: 9 in osteoarthritis and 10 in rheumatoid arthritis. The rheumatoid arthritis studies used intact type II collagen, which is a different product from hydrolysed marine collagen. The authors found most studies poor quality and could not reach a verdict.
Results
Unknown. This evidence is about a different kind of collagen and does not show marine collagen helps or harms rheumatoid arthritis.
Why this rating
Poor-quality studies, a different collagen product and no clear answer.
Form and dose studied
Intact type II collagen in the rheumatoid studies; not hydrolysed fish collagen.
Who was studied
People with rheumatoid arthritis.
Limits
Different product from marine collagen; poor trial quality; last trials from 2011.
Why researchers looked
Some research asks whether eating collagen could calm the immune attack on joint collagen.
Traditional use
Marine collagen is a protein from fish skin, scales and bones. Claims that it helps skin or joints are modern supplement marketing; what matters here is what trials found.
Proposed mechanism Hypothesis
The review describes a hypothesis that exposing the gut immune system to collagen may suppress the immune response against collagen in the joints. It is a hypothesis, not shown here.
A proposed mechanism does not show that the effect happens in people.
Anyone with an autoimmune disease should ask their doctor before supplements.
Where marine collagen comes from
Not enough evidenceMarine collagen is made from fish skin, scales and bones left over from fish processing, usually broken down into small peptides. The main collagen in fish skin is type I. No source read gave amounts of collagen per serving of fish skin or any fish food.
4 studiesHydrolysed collagen peptides (pills, powders, drinks) are not the sam…
Studies, doses and limits
What the trials found
A 2026 review says fish collagen hydrolysates come from fish processing wastes. A 2020 allergy study extracted type I collagen with alpha-1 and alpha-2 chains from the skin and muscle of salmon, barramundi and tuna, and a 2000 study made fish gelatin (type I collagen) from fish skin. A trial product was from freshwater fish skin. No USDA or NIH figure for collagen per portion of fish was read.
Results
Known source material; how much usable collagen fish foods give compared with pills is not established here.
Why this rating
Source facts are clear, but no amounts per food portion were found, and food and pill collagen were not compared.
Form and dose studied
Hydrolysed collagen peptides (pills, powders, drinks) are not the same as eating fish skin; the sources read do not compare them.
Limits
No composition data were read for fish foods.
Why researchers looked
People ask what is in a marine collagen product and whether eating fish gives the same thing.
Traditional use
Marine collagen is a protein from fish skin, scales and bones. Claims that it helps skin or joints are modern supplement marketing; what matters here is what trials found.
Proposed mechanism Established nutrition
Not applicable: this item is about the source, not an effect.
A proposed mechanism does not show that the effect happens in people.
Fish skin, scales and bones carry the same fish-allergy risk as a supplement made from them.
Connections to the rest of health
How Marine Collagen (Fish) 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 |
|---|---|---|---|---|
| Skin Hair | Low certainty | Skin hydration, elasticity and wrinkles: Trials of hydrolysed collagen, some of it from fish, found small gains in skin hydration and elasticity in middle-aged adults over about 12 weeks. Three recent reviews of collagen from all sources found more benefit than placebo in most trials, but most trials were rated high risk of bias and fish collagen is not separated out. Trials of fish collagen alone are few, short and small. | 14 20 3 6 13 8 5 15 | |
| Healthy Aging | Low certainty | Skin hydration, elasticity and wrinkles: Trials of hydrolysed collagen, some of it from fish, found small gains in skin hydration and elasticity in middle-aged adults over about 12 weeks. Three recent reviews of collagen from all sources found more benefit than placebo in most trials, but most trials were rated high risk of bias and fish collagen is not separated out. Trials of fish collagen alone are few, short and small. Knee osteoarthritis pain and function: A 2025 pooled analysis of 11 trials (870 people) of collagen supplements in knee osteoarthritis found lower pain and better function scores than placebo. The abstract does not say which collagen types or sources were used, so it cannot be credited to marine collagen. Results differed a lot between trials. | 14 20 3 6 13 8 5 15 17 9 2 | |
| Joint Health | Low certainty | Knee osteoarthritis pain and function: A 2025 pooled analysis of 11 trials (870 people) of collagen supplements in knee osteoarthritis found lower pain and better function scores than placebo. The abstract does not say which collagen types or sources were used, so it cannot be credited to marine collagen. Results differed a lot between trials. Rheumatoid arthritis: A 2022 review of 10 rheumatoid arthritis studies, all of intact type II collagen (not fish skin collagen), could not decide whether collagen helps or harms. Several included studies reported high adverse effects and low efficacy compared with usual treatments. | 17 9 | |
| Bone Health | Not enough evidence | Bone density and osteoporosis: A 2026 narrative review says early human trials of fish collagen hydrolysates suggest benefits for bone turnover and bone density, but large, well-run trials are still needed. Most of the evidence it covers is from cells and animals. | 2 | |
| Balanced Nutrition | Not enough evidence | Where marine collagen comes from: Marine collagen is made from fish skin, scales and bones left over from fish processing, usually broken down into small peptides. The main collagen in fish skin is type I. No source read gave amounts of collagen per serving of fish skin or any fish food. | 2 10 16 13 |
B. Body systems
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Skin | Biological association | Low certainty | Studied for: Skin hydration, elasticity and wrinkles | 14 20 3 6 13 8 5 15 |
| Integumentary System | Biological association | Low certainty | Studied for: Skin hydration, elasticity and wrinkles | 14 20 3 6 13 8 5 15 |
| Musculoskeletal System | Biological association | Low certainty | Studied for: Knee osteoarthritis pain and function | 17 9 |
| Joints | Biological association | Low certainty | Studied for: Knee osteoarthritis pain and function Studied for: Rheumatoid arthritis | 17 9 |
| Skeletal System | Biological association | Not enough evidence | Studied for: Bone density and osteoporosis | 2 |
| Bone | Biological association | Not enough evidence | Studied for: Bone density and osteoporosis | 2 |
| Immune System | Biological association | Not enough evidence | Studied for: Rheumatoid arthritis | 9 |
| Nutrition | Biological association | Not enough evidence | Studied for: Where marine collagen comes from | 2 10 16 13 |
E. Health conditions
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Fish allergy | Adverse effect or risk | Case reports and laboratory studies | Fish collagen is a recognised allergen and can cause anaphylaxis in people allergic to fish. Fish collagen is a recognised allergen and has caused anaphylaxis. Preparation or compound: Fish collagen and fish gelatin |
18 10 11 |
| Skin ageing | Preliminary | Small gains in hydration and elasticity in trials; low certainty for fish collagen. Preparation or compound: Hydrolysed collagen |
14 13 | |
| Knee osteoarthritis | Preliminary | Lower pain scores with collagen of unspecified source; high differences between trials. Preparation or compound: Oral collagen |
17 |
I. Biomarkers
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Skin hydration | Biological association | Low certainty | Measured in trials: higher with collagen in most trials. A lab change is not the same as a health benefit. | 14 13 |
| Skin elasticity | Biological association | Low certainty | Measured in trials: higher with collagen in several trials. A lab change is not the same as a health benefit. | 14 6 |
| Knee pain and function scores | Biological association | Low certainty | Measured in trials: lower (better) with collagen in the pooled analysis. A lab change is not the same as a health benefit. | 17 9 |
| Bone mineral density | Biological association | Not enough evidence | Measured in trials: unclear; early signals in a review. A lab change is not the same as a health benefit. | 2 |
K. Biological pathways
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Parvalbumin | Preliminary mechanism | Human | The main fish allergen, often found together with collagen sensitisation. | 10 19 |
| Type I collagen alpha chains | Preliminary mechanism | Human | The collagen chains found in fish skin and recognised as allergens. | 10 |
L. Active compounds
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Type I collagen (alpha-1 and alpha-2 chains) | Biological association | Human | The main collagen in fish skin; recognised as an allergen (Lat c 6, Sal s 6). Preparation or compound: Fish skin and muscle |
10 16 |
| Collagen peptides (hydrolysate) | Biological association | Human | The form used in supplement trials. Preparation or compound: Fish skin and scales |
13 6 |
| Fish gelatin | Biological association | Human | IgE found in some fish-allergic patients; little cross-reaction with cow gelatin. Preparation or compound: Fish skin |
16 |
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).
Evidence at a glance: what the research found for 5 outcomes
Each outcome below is one thing researchers measured. Certainty is how far the evidence can be trusted, not how well it works. The full studies are on the next tab.
The evidence
The research centre for Marine Collagen (Fish). 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 searched PubMed for trials, reviews and allergy studies on marine and fish collagen, checked each title with PubMed's summary record and read each abstract. Only abstracts were read. Three allergy case reports and letters had no abstract and are cited by title only. The NCCIH collagen page returned a 404 and is marked unread.
Study library: every study we checked 21
| Study | Design | People | Product, dose, length | Result |
|---|---|---|---|---|
| Abe 2020 A case of anaphylaxis due to fish collagen in a gummy candy. Allergol Int · PMID 31262631 · DOI |
Case report |
1 One patient (letter) |
Fish collagen in a gummy candy Gummy candy Single event |
Only the title was read: it reports a case of anaphylaxis due to fish collagen in a gummy candy. No abstract is available, so no details are stated. One case (from the title). (Not applicable.) Methods, limits and fundingOutcomes: Allergic reaction Limitations: Title only; no abstract was available. Funding and conflicts: Not stated. Read: title-only |
| Alvi 2026 Therapeutic potential of fish collagen hydrolysates in osteoporosis prevention: a narrative review based on cellular, molecular, and clinical evidence. Osteoporos Int · PMID 41028243 · DOI |
Narrative review mixed |
Review of cell, animal and early human work on fish collagen hydrolysates and bone | Fish collagen hydrolysates Oral supplement |
Early clinical trials suggest benefits on bone turnover and bone density, but the authors say large randomised studies are still needed. Most of the detail is from cell and animal work. Not applicable. (Not applicable.) Methods, limits and fundingOutcomes: Bone cell markers, bone density Limitations: Narrative review; no numbers or trial list in the abstract. It also states that bioavailability is high, which the abstract does not test. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Bassila 2026 Efficacy and safety of hydrolyzed collagen supplementation on skin health outcomes: a systematic literature review of randomized controlled trials. Eur J Clin Nutr · PMID 42342959 · DOI |
Systematic review |
25 randomised trials (13 to 236 participants each); mostly healthy volunteers, 7 in people with a long-term condition | Hydrolysed collagen (several sources) Oral supplement Varied · vs Placebo or active comparators |
Hydrolysed collagen beat placebo for skin hydration in 10 of 15 trials, elasticity in 10 of 13 and wrinkle depth or volume in 9 of 10. Water loss through the skin was less consistent. It was generally well tolerated with few side effects. Counts of trials only: hydration 10/15, elasticity 10/13, wrinkles 9/10. (No pooled interval (narrative synthesis).) Methods, limits and fundingOutcomes: Skin hydration, elasticity, wrinkles, water loss through the skin, safety, quality of life Limitations: The authors rate most trials as high risk of bias. Searches ran to April 2023. Marine collagen is not separated out in the abstract. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Chikazawa 2015 Fish-collagen allergy: a pitfall of the prick-to-prick test with raw fish. Br J Dermatol · PMID 26111301 · DOI |
Case report |
Letter on fish collagen allergy and skin testing | Fish collagen |
Only the title was read: it describes a pitfall of the prick-to-prick test with raw fish in fish-collagen allergy. No abstract is available, so no other details are stated. Not applicable. (Not applicable.) Methods, limits and fundingOutcomes: Allergy testing Limitations: Title only. Funding and conflicts: Not stated. Read: title-only |
| Choi 2019 Oral Collagen Supplementation: A Systematic Review of Dermatological Applications. J Drugs Dermatol · PMID 30681787 |
Systematic review |
805 11 placebo-controlled trials on skin quality, ageing and skin conditions |
Collagen hydrolysate (8 studies), collagen tripeptide (2), collagen dipeptide (1) Oral supplement 2.5 g to 10 g a day (hydrolysate studies) 8 to 24 weeks; 4 to 12 weeks for tripeptide · vs Placebo |
The authors call the results promising for skin ageing and wound healing and say collagen supplements were generally safe, with no adverse events reported. They note that rules on quality, absorption and efficacy are lacking. Not applicable. (Not applicable.) Methods, limits and fundingOutcomes: Skin quality, ageing, wound healing, cellulite Limitations: Sources of collagen are not separated in the abstract. Searched PubMed only. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Evans 2021 A randomized, triple-blind, placebo-controlled, parallel study to evaluate the efficacy of a freshwater marine collagen on skin wrinkles and elasticity. J Cosmet Dermatol · PMID 32799362 · DOI |
Randomised controlled trial |
Women aged 45 to 60 | Hydrolysed freshwater fish collagen (a branded product) Oral supplement 12 weeks (checks at 0, 6, 12 weeks) · vs Placebo |
After 12 weeks the collagen group had a 35% fall in wrinkle score from its own start (p = 0.035) and a 24% bigger fall on the right side of the face than placebo. In women aged 45 to 54, cheek elasticity rose 20% at week 6 and 10% at week 12 from start. Self-rated scores were higher than placebo at week 12. The authors report it was safe and well tolerated. 35% fall in wrinkle score from baseline (p = 0.035); 24% larger fall than placebo on the right cheek; self-rated overall skin score +9%, elasticity +23%, hydration +14% versus placebo. (Not given in the abstract.) Methods, limits and fundingOutcomes: Wrinkle score (VISIA), elasticity (Cutometer), self-rated skin quality Limitations: Some results are changes from the group's own start rather than against placebo. Subgroup by age was planned but small. Participant numbers are not in the abstract. A branded product was tested. Funding and conflicts: Funding and conflicts not stated in the abstract; a branded product was tested. Read: abstract |
| Fujimoto 2016 Anaphylaxis provoked by ingestion of hydrolyzed fish collagen probably induced by epicutaneous sensitization. Allergol Int · PMID 27569115 · DOI |
Case report |
1 One patient (letter) |
Hydrolysed fish collagen Oral Single event |
Only the title was read: it reports anaphylaxis after eating hydrolysed fish collagen, probably after the person was first sensitised through the skin. No abstract is available, so no other details are stated. One case (from the title). (Not applicable.) Methods, limits and fundingOutcomes: Allergic reaction Limitations: Title only; no abstract was available. The skin-sensitisation idea is the authors' word 'probably'. Funding and conflicts: Not stated. Read: title-only |
| Hyun 2025 Targeting Aging Skin with GABALAGEN(®): A Synergistic Marine Nutricosmetic Ingredient Validated Through Human Randomized Trials. Antioxidants (Basel) · PMID 40227205 · DOI |
Randomised controlled trial |
100 100 adults aged 35 to 60; 94% finished |
Low-molecular-weight fish collagen combined with GABA (a branded product, made by fermenting fish collagen) Jelly 1,500 mg a day 12 weeks · vs Placebo |
The authors report about 20% more skin hydration and a 15% fall in wrinkle depth by week 12, with better density and elasticity and no adverse effects. The product also contains GABA, so the result cannot be credited to collagen alone. Hydration about +20%, wrinkle depth about -15% (the abstract does not say whether versus placebo or versus start). (Not given in the abstract.) Methods, limits and fundingOutcomes: Skin hydration, wrinkle depth, density, elasticity Limitations: Combination product (fish collagen plus GABA). The abstract is written to promote the ingredient and does not give clear comparisons with placebo. Funding and conflicts: Written by the makers' team and promotional in tone; treat as industry-linked. Read: abstract |
| Jabbari 2022 Is collagen supplementation friend or foe in rheumatoid arthritis and osteoarthritis? A comprehensive systematic review. Int J Rheum Dis · PMID 35791039 · DOI |
Systematic review |
19 articles: 9 in osteoarthritis (intact or hydrolysed collagen) and 10 in rheumatoid arthritis (intact type II collagen only) | Intact and hydrolysed collagen (source not separated in the abstract) Oral supplement Varied · vs Placebo or usual treatment |
The authors could not decide whether collagen helps or harms in these diseases. Several included studies reported high rates of adverse effects and low effectiveness compared with usual treatments, and most studies were poor quality. Not applicable. (Not applicable.) Methods, limits and fundingOutcomes: Joint symptoms and disease measures Limitations: Latest trials in the review were from 2011 (rheumatoid arthritis) and 2016 (osteoarthritis). The abstract does not give which collagen sources were used. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Kalic 2020 Collagen-An Important Fish Allergen for Improved Diagnosis. J Allergy Clin Immunol Pract · PMID 32389794 · DOI |
Laboratory study human serum |
101 101 fish-allergic patients |
Type I collagen from Atlantic salmon, barramundi and yellowfin tuna skin and muscle Laboratory extracts |
21 of 101 patients (21%) were sensitised to collagen. Eight of those had no IgE to parvalbumin from some fish species, so a parvalbumin-only test could miss them. Collagen caused functional IgE cross-linking in laboratory cell tests. Salmon and barramundi collagen were registered as official allergens (Sal s 6 and Lat c 6). 21 of 101 (21%) sensitised; 8 collagen-sensitised patients lacked parvalbumin IgE to some fish. (Not applicable.) Methods, limits and fundingOutcomes: IgE to collagen; cell-based tests of allergic activation Limitations: Laboratory tests on blood; sensitisation is not the same as a clinical reaction. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Kobayashi 2016 Fish collagen is an important panallergen in the Japanese population. Allergy · PMID 26785247 · DOI |
Laboratory study human serum |
Japanese patients with fish allergy (number not in the abstract) | Mackerel collagen and parvalbumin Laboratory extracts |
Half (50%) of the patients had IgE to mackerel collagen and 44% to mackerel parvalbumin. Mackerel collagen cross-reacted strongly with 22 fish species. A newer test showed collagen could trigger mast cells. The authors link the high rate to a custom of eating raw fish. IgE to collagen 50%, to parvalbumin 44%; cross-reactivity inhibition 87% to 98% across 22 species. (Not given in the abstract.) Methods, limits and fundingOutcomes: IgE to collagen and parvalbumin; cross-reactivity Limitations: Japanese patients only; the abstract does not give how many were studied. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Kobayashi 2016 Allergy to fish collagen: Thermostability of collagen and IgE reactivity of patients' sera with extracts of 11 species of bony and cartilaginous fish. Allergol Int · PMID 27236375 · DOI |
Laboratory study human serum |
Extracts of 7 bony and 4 cartilaginous fish tested with serum from allergic patients; skin prick tests in one patient | Fish meat extracts Heated extracts Heating up to 140 C for 10 min or 100 C for 320 min |
Collagen broke down at very high heat, but patients' IgE reactions to the extracts did not change even after heavy heating. Reactions to cartilaginous fish (such as sharks and rays) were lower than to bony fish. In one patient, all heated extracts caused skin-test reactions. IgE reactivity unchanged after heating. (Not applicable.) Methods, limits and fundingOutcomes: Collagen breakdown and IgE reactivity Limitations: Laboratory and serum tests with few patients; not a measure of real-life reactions. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Lee 2024 Liquid collagen from freshwater fish skin ameliorates hydration, roughness and elasticity in photo-aged skin: a randomized, controlled, clinical study. Nutr Res Pract · PMID 38854476 · DOI |
Randomised controlled trial |
85 85 adults aged 35 to 60 with sun-aged skin; 78 completed |
Liquid fish collagen drink from freshwater fish skin (a branded tripeptide product) 50 mL daily drink 1,000 mg collagen a day 12 weeks (checks at 0, 6, 12 weeks) · vs Placebo drink |
Skin hydration was higher than at the start from week 6 (p < 0.001). At 12 weeks, crow's-feet score and skin roughness were better than with placebo (p < 0.05). Some elasticity measures were better than placebo at 6 weeks. No side effects were seen and blood tests stayed in the normal range. Significant differences versus placebo for crow's-feet score and roughness at 12 weeks (p < 0.05). (Not given in the abstract.) Methods, limits and fundingOutcomes: Skin hydration, wrinkles, roughness, elasticity, blood tests Limitations: Small trial, 12 weeks, one product. The abstract does not state who paid for it. Funding and conflicts: Not stated in the abstract; a branded product was tested. Read: abstract |
| Pu 2023 Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients · PMID 37432180 · DOI |
Systematic review meta analysis |
1721 26 randomised trials of hydrolysed collagen from several sources (marine and other); skin hydration and elasticity |
Hydrolysed collagen (several sources) Oral supplement Varied; subgroups by duration · vs Placebo |
Hydrolysed collagen improved skin hydration and elasticity compared with placebo. Hydration results varied by collagen source and by how long it was taken. For elasticity there was no significant difference between sources. Hydration: overall effect Z = 4.94, p < 0.00001. Elasticity: Z = 4.49, p < 0.00001. Difference between sources for elasticity p = 0.21. (Not given in the abstract.) Methods, limits and fundingOutcomes: Skin hydration; skin elasticity Limitations: The authors found several biases in the included trials and call for larger trials. Marine collagen is not separated out in the abstract. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Rahman 2024 Unlocking the Therapeutic Potential of Marine Collagen: A Scientific Exploration for Delaying Skin Aging. Mar Drugs · PMID 38667776 · DOI |
Narrative review mixed |
Review of laboratory, animal and human work on marine collagen and skin ageing | Marine collagen (several fish sources) Oral supplement and tissue-engineering uses |
A review that covers cell, animal and human work. It describes reduced oxidative stress and fewer wrinkles and notes limits on how far the findings apply. It is a broad overview, not a pooled analysis. Not applicable. (Not applicable.) Methods, limits and fundingOutcomes: Skin ageing Limitations: Narrative review; the abstract mixes cell, animal and human results and gives no certainty rating. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Sakaguchi 2000 IgE antibody to fish gelatin (type I collagen) in patients with fish allergy. J Allergy Clin Immunol · PMID 10984381 · DOI |
Laboratory study human serum |
27 Serum from 10 patients with fish allergy, 2 with fish and bovine gelatin allergy, and 15 with atopic dermatitis and IgE to fish |
Fish gelatin (type I collagen) made from fish skin Laboratory extracts |
3 of 10 fish-allergic patients had IgE to fish gelatin, both patients with bovine gelatin allergy did, and 5 of 15 with atopic dermatitis did. There was cross-reactivity between gelatins from different fish but little between fish and bovine gelatin. 3/10, 2/2 and 5/15 patients had IgE to fish gelatin. (Not applicable.) Methods, limits and fundingOutcomes: IgE to fish gelatin Limitations: Small, early laboratory study of antibodies; it does not show how many people react when they eat it. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Simental-Mendia 2025 Effect of collagen supplementation on knee osteoarthritis: an updated systematic review and meta-analysis of randomised controlled trials. Clin Exp Rheumatol · PMID 39212129 · DOI |
Systematic review meta analysis |
870 11 randomised trials in people with knee osteoarthritis (451 collagen, 419 placebo) |
Oral collagen-based supplements (source not separated in the abstract) Oral supplement Varied · vs Placebo |
Pooled results favoured collagen for both function and pain. Function: mean difference -6.46. Pain: mean difference -13.63 (lower is better). (Function -9.52 to -3.40 (I2 75%); pain -20.67 to -6.58 (I2 88%).) Methods, limits and fundingOutcomes: Function and pain scores Limitations: Very large differences between trials (I2 75% and 88%). The abstract does not say which collagen types were used, so marine collagen is not separated out. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Ueno 2020 A case of pediatric anaphylaxis caused by gummy tablets containing fish collagen. Asia Pac Allergy · PMID 33178560 · DOI |
Case report |
1 A 9-year-old girl |
Fish collagen in fruit-flavoured gummy tablets Gummy tablets Two tablets Single event |
She had anaphylaxis after two gummy tablets. A supervised oral challenge with fish collagen confirmed the fish collagen as the cause, and tests found a 120-kDa band that mass spectrometry identified as fish collagen. Salmon collagen and other fish that caused symptoms showed the same band. The authors say processed foods may contain fish collagen. One confirmed case. (Not applicable.) Methods, limits and fundingOutcomes: Allergic reaction and its cause Limitations: A single case; it shows that reactions can happen, not how often. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Wai 2023 Differential patterns of fish sensitization in Asian populations: Implication for precision diagnosis. Allergol Int · PMID 37032258 · DOI |
Laboratory study human serum |
103 103 fish-allergic people from Hong Kong (67) and Japan (46) |
Salmon and grass carp allergens Laboratory extracts and cooked salmon |
Parvalbumin was the main allergen (74.7% sensitised), followed by collagen (38.9%, found in salmon). Japanese patients reacted to more heat-labile salmon allergens. Baking and frying kept more fish proteins than steaming or boiling. Parvalbumin 74.7%, collagen 38.9%, aldolase 38.5%, enolase 17.8%. (Not applicable.) Methods, limits and fundingOutcomes: Sensitisation to fish allergens; effect of cooking Limitations: Laboratory tests; two Asian populations only. Funding and conflicts: Not stated in the abstract. Read: abstract |
| de Miranda 2021 Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis. Int J Dermatol · PMID 33742704 · DOI |
Systematic review meta analysis |
1125 19 randomised, double-blind trials; adults aged 20 to 70 (95% women) |
Hydrolysed collagen (several sources) Oral supplement The authors conclude 90 days of use was effective · vs Placebo |
Pooled results favoured hydrolysed collagen over placebo for skin hydration, elasticity and wrinkles. Direction only; numbers are not in the abstract. (Not given in the abstract.) Methods, limits and fundingOutcomes: Wrinkles, hydration, elasticity, firmness Limitations: Almost all participants were women. Marine collagen is not separated out in the abstract. A published comment criticised how different the included studies were (PMID 34196407, seen by title only). Funding and conflicts: Not stated in the abstract. Read: abstract |
| s-nccih-collagen NCCIH: Collagen (page not found) · Source |
Reference database n/a |
Methods, limits and fundingRead: not-read |
What we do not know yet
- No large, independent, long trial of fish collagen alone on skin was read.
- No randomised trial of marine collagen on bone density was read.
- No safety data in pregnancy, breastfeeding or children were read.
- No analysis of contaminants or label accuracy of marine collagen products was found.
- No collagen amounts per portion of fish skin or fish foods were found.
- Hair, nails and wound healing were not researched here.
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".
Other 4
Skin hydration
Higher with collagen in most trials in trials
How much water the outer layer of the skin holds, measured with a skin meter.
Low certaintyResults and what it means
Why it was measured
The most common measure used in collagen skin trials.
Statistical vs. clinical meaning
Small cosmetic changes measured by instruments; not shown to change how people feel or look in daily life.
Safety implication
Fish allergy is the main safety concern.
| Study | Result | People | Product |
|---|---|---|---|
| 14 | Pooled hydration effect favoured hydrolysed collagen (Z = 4.94, p < 0.00001); varied by source and duration | 26 trials, 1,721 people | Hydrolysed collagen from several sources |
| 13 | Hydration higher than at start from week 6 (p < 0.001) | 85 adults with sun-aged skin | Fish skin collagen drink, 12 weeks |
Skin elasticity
Higher with collagen in several trials in trials
How well the skin springs back after being pulled gently, measured with a suction device.
Low certaintyResults and what it means
Why it was measured
Loss of elasticity is a sign of skin ageing.
Statistical vs. clinical meaning
Instrument readings; the fish-collagen figure is against the group's own start.
Safety implication
None beyond fish allergy.
| Study | Result | People | Product |
|---|---|---|---|
| 14 | Pooled elasticity effect favoured hydrolysed collagen (Z = 4.49, p < 0.00001); no significant difference between sources (p = 0.21) | 26 trials, 1,721 people | Hydrolysed collagen from several sources |
| 6 | Cheek elasticity +20% at week 6 and +10% at week 12 from start in women 45 to 54 | Women aged 45 to 60 | Freshwater fish collagen, 12 weeks |
Knee pain and function scores
Lower (better) with collagen in the pooled analysis in trials
Questionnaire scores for pain and ease of movement in people with knee osteoarthritis.
Low certaintyResults and what it means
Why it was measured
The main way osteoarthritis trials measure benefit.
Statistical vs. clinical meaning
Questionnaire scores; results varied widely between trials.
Safety implication
A second review reported high adverse effects in some studies.
| Study | Result | People | Product |
|---|---|---|---|
| 17 | Pain MD -13.63 (95% CI -20.67 to -6.58), I2 88%; function MD -6.46 (95% CI -9.52 to -3.40), I2 75% | 11 trials, 870 people with knee osteoarthritis | Oral collagen-based supplements, source not stated |
Bone mineral density
Unclear; early signals in a review in trials
A scan measure of how dense and strong the bones are.
Not enough evidenceResults and what it means
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
- Fish allergy comes first: fish collagen can cause severe reactions. Fish collagen is a recognised fish allergen. A 9-year-old girl had anaphylaxis after two gummy tablets containing fish collagen, and an oral challenge confirmed fish collagen as the cause. Other case reports (read by title only) describe anaphylaxis after fish collagen in a gummy candy and after hydrolysed fish collagen. In laboratory tests of blood from fish-allergic people, 21 of 101 (21%) had IgE to fish collagen; in another study of 103 people, 38.9% were sensitised to salmon collagen; and 50% of a group of Japanese patients had IgE to mackerel collagen. Collagen cross-reacted across 22 fish species. People with fish allergy should ask an allergist before using any product that may contain fish collagen. Case reports and laboratory studies 18 1 7 10 19 11
- A usual fish-allergy test can miss a collagen allergy. Fish allergy tests often look for parvalbumin only. In the 2020 study, 8 collagen-sensitised patients had no IgE to parvalbumin from some fish species. A 2015 letter (title only) calls the prick-to-prick test with raw fish a pitfall for fish-collagen allergy. Ask an allergist which tests include collagen. Laboratory study and letter 10 4
- Cooking or processing does not reliably remove the allergen. Fish collagen only broke down at very high heat, and patients' IgE reactions to heated extracts stayed unchanged even after heavy heating. Baking and frying kept more fish proteins than steaming or boiling. Reactions to cartilaginous fish (sharks, rays) were lower than to bony fish in laboratory tests, but in one patient all heated extracts still caused skin-test reactions. Laboratory studies 12 19
- Fish collagen can hide in processed foods. The case reports involve gummy tablets and gummy candy. The 2020 case authors warn that processed foods may contain fish collagen. Read labels for fish, fish collagen, fish gelatin or marine collagen. Fish gelatin is made from fish skin and is type I collagen. Case report and laboratory study 18 16
- No side effects were reported in short trials, but they were short. In the fish-collagen trials read, authors reported no adverse events over 12 weeks. A 2026 review of 25 trials of hydrolysed collagen (all sources) found it generally well tolerated with few side effects, but rated most trials high risk of bias. A 2022 review of arthritis studies noted high adverse effects in several included studies. No long-term safety data were read. Randomised trials and systematic reviews 13 8 3 9 5
Side effects 2
| Effect | How often | Severity and recovery | Evidence |
|---|---|---|---|
| Allergic reactions including anaphylaxis (in people allergic to fish) Two case reports and one letter were read by title only. | Not known. Sensitisation to fish collagen was found in 21 of 101 (21%) fish-allergic patients in one study; sensitisation is not the same as a reaction. | Can be life-threatening Not described in the abstracts read. | Case reports and laboratory studies 18 1 7 4 10 |
| Mild side effects (not specified) The review did not separate fish from other collagen. | Described as low incidence in a 2026 review; no figures in the abstract. | Usually mild Not described. | Systematic review 3 5 |
Liver
No liver or kidney injury from marine collagen was found in the sources read. A liver-safety reference (LiverTox) was not opened. In one 12-week trial, blood tests stayed in the normal range. 13
How often. No frequency was found.
Monitoring. No agency monitoring advice was found.
This is a safety connection. It is not evidence that Marine Collagen (Fish) supports liver health.
Medicines and supplements 3
| With | Why it matters | Importance | Evidence | What to do |
|---|---|---|---|---|
| Prescription and over-the-counter medicines prescription | Not described in the sources read. | No drug interaction was found in the abstracts read; none was checked against a drug-interaction reference. | None found Not enough evidence 3 | Ask a pharmacist, especially if you take several medicines. |
| Other ingredients in combination products (GABA, vitamins, minerals, plant extracts) supplement | Many trial products mix collagen with other ingredients. | Effects and side effects of a mixed product cannot be tied to collagen alone; for example, one trial product combined fish collagen with GABA. | Randomised trial Low certainty 8 | Check the full ingredient list for fish-derived and other allergens. |
| Other fish-derived products (fish gelatin) food | Fish gelatin is type I collagen from fish skin, so it can carry the same allergen. | IgE to fish gelatin was found in some fish-allergic patients, with cross-reactivity between fish gelatins and little with cow gelatin (small laboratory study). | Laboratory study Low certainty 16 | People with fish allergy should ask an allergist about any fish-derived ingredient. |
Who should check first 5
| Situation | Advice | Evidence |
|---|---|---|
| Fish allergy (including allergy to fish gelatin) | Avoid unless an allergist says otherwise. Fish collagen is a recognised allergen and has caused anaphylaxis. | Case reports and laboratory studies 18 10 11 |
| Pregnancy and breastfeeding | No safety study in pregnancy or breastfeeding was read. Ask a doctor or pharmacist. | No data found |
| Children | No trial in children was read. One case report describes anaphylaxis in a 9-year-old. Ask a paediatrician. | Case report 18 |
| Rheumatoid arthritis or other autoimmune disease | Evidence is unclear and about a different kind of collagen. Ask your doctor. | Systematic review 9 |
| Kidney or liver disease | No source read gave advice for these conditions. Ask a doctor. | No data found |
Overdose, product quality and regulators
Summary. No harmful-amount or poisoning data for marine collagen were found. The known danger is allergy, not toxicity from amount.
Animal. Not reviewed.
Overdose response. Not described in the sources read. For a severe allergic reaction call emergency services.
Genotoxicity. Not researched.
No analysis of heavy metals, marine toxins or label accuracy of marine collagen products was found, so none is claimed.
Quality rules. A 2019 review of collagen skin trials says regulations are lacking on quality, absorption and efficacy of collagen supplements. 5
Hidden fish collagen in other foods. The 2020 case report authors say processed foods may contain fish collagen, so a person with fish allergy may be exposed without knowing. 18
| Body | Action | Date |
|---|---|---|
| WHO/IUIS Allergen Nomenclature (as reported in a 2020 study abstract) (International) | Fish collagen type I alpha chains from barramundi and Atlantic salmon were registered as official allergens Lat c 6 and Sal s 6 at allergen.org. source | 2020 |
When to get medical help
- After fish collagen or any fish product: trouble breathing, swelling of the lips, face or throat, widespread hives, repeated vomiting, dizziness or fainting. These can be signs of anaphylaxis: call emergency services at once.
- A child with a known fish allergy who has eaten a gummy, drink or supplement that may contain fish collagen and becomes unwell: call emergency services.
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 marine collagen?
Does marine collagen help skin?
Is fish collagen better than cow or pig collagen?
Not shown. A 2023 pooled analysis found no significant difference between sources for skin elasticity, and hydration results varied by source.
Does it help joints?
Does it help bones?
Unknown. A 2026 review says early trials are encouraging but gives no numbers and says large trials are needed.
Can marine collagen cause an allergic reaction?
Will a normal fish allergy test show a collagen allergy?
Does cooking remove the allergen?
Can it be hidden in other products?
Is it safe in pregnancy or for children?
No safety study in pregnancy, breastfeeding or children was read. Ask a doctor or pharmacist.
Does it interact with medicines?
No interaction was found in the sources read, but no drug-interaction reference was checked. Ask a pharmacist.
Are marine collagen products checked for quality?
A 2019 review says rules on quality, absorption and efficacy of collagen supplements are lacking, and no analysis of contaminants or labels for marine collagen was found.
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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 searched PubMed for trials, reviews and allergy studies on marine and fish collagen, checked each title with PubMed's summary record and read each abstract. Only abstracts were read. Three allergy case reports and letters had no abstract and are cited by title only. The NCCIH collagen page returned a 404 and is marked unread.
- 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. Some fish-collagen trials tested branded products and may have maker links not stated in abstracts.
Sources 21
Each source was opened and checked. Where we read only the abstract, it says so. The small numbers in the text point here.
- Abe N, Ito T, Kobayashi T, Egusa C, Maeda T et al.. A case of anaphylaxis due to fish collagen in a gummy candy.. Allergol Int. 2020. PMID 31262631. DOI 10.1016/j.alit.2019.05.011. (title-only)
- Alvi A, Parashar K, Siddiqui S, Arshad M. Therapeutic potential of fish collagen hydrolysates in osteoporosis prevention: a narrative review based on cellular, molecular, and clinical evidence.. Osteoporos Int. 2026. PMID 41028243. DOI 10.1007/s00198-025-07698-5. (abstract)
- Bassila C, Bassila JC, Slim M. Efficacy and safety of hydrolyzed collagen supplementation on skin health outcomes: a systematic literature review of randomized controlled trials.. Eur J Clin Nutr. 2026. PMID 42342959. DOI 10.1038/s41430-026-01778-3. (abstract)
- Chikazawa S, Hashimoto T, Kobayashi Y, Satoh T. Fish-collagen allergy: a pitfall of the prick-to-prick test with raw fish.. Br J Dermatol. 2015. PMID 26111301. DOI 10.1111/bjd.13962. (title-only)
- Choi FD, Sung CT, Juhasz ML, Mesinkovsk NA. Oral Collagen Supplementation: A Systematic Review of Dermatological Applications.. J Drugs Dermatol. 2019. PMID 30681787. (abstract)
- Evans M, Lewis ED, Zakaria N, Pelipyagina T, Guthrie N. A randomized, triple-blind, placebo-controlled, parallel study to evaluate the efficacy of a freshwater marine collagen on skin wrinkles and elasticity.. J Cosmet Dermatol. 2021. PMID 32799362. DOI 10.1111/jocd.13676. (abstract)
- Fujimoto W, Fukuda M, Yokooji T, Yamamoto T, Tanaka A et al.. Anaphylaxis provoked by ingestion of hydrolyzed fish collagen probably induced by epicutaneous sensitization.. Allergol Int. 2016. PMID 27569115. DOI 10.1016/j.alit.2016.03.012. (title-only)
- Hyun J, Rheu KM, Lee BJ, Ryu B. Targeting Aging Skin with GABALAGEN(®): A Synergistic Marine Nutricosmetic Ingredient Validated Through Human Randomized Trials.. Antioxidants (Basel). 2025. PMID 40227205. DOI 10.3390/antiox14030245. (abstract)
- Jabbari M, Barati M, Khodaei M, Babashahi M, Kalhori A et al.. Is collagen supplementation friend or foe in rheumatoid arthritis and osteoarthritis? A comprehensive systematic review.. Int J Rheum Dis. 2022. PMID 35791039. DOI 10.1111/1756-185X.14382. (abstract)
- Kalic T, Kamath SD, Ruethers T, Taki AC, Nugraha R et al.. Collagen-An Important Fish Allergen for Improved Diagnosis.. J Allergy Clin Immunol Pract. 2020. PMID 32389794. DOI 10.1016/j.jaip.2020.04.063. (abstract)
- Kobayashi Y, Akiyama H, Huge J, Kubota H, Chikazawa S et al.. Fish collagen is an important panallergen in the Japanese population.. Allergy. 2016. PMID 26785247. DOI 10.1111/all.12836. (abstract)
- Kobayashi Y, Kuriyama T, Nakagawara R, Aihara M, Hamada-Sato N et al.. Allergy to fish collagen: Thermostability of collagen and IgE reactivity of patients' sera with extracts of 11 species of bony and cartilaginous fish.. Allergol Int. 2016. PMID 27236375. DOI 10.1016/j.alit.2016.04.012. (abstract)
- Lee JS, Yoon YC, Kim JM, Kim YH, Kang YH et al.. Liquid collagen from freshwater fish skin ameliorates hydration, roughness and elasticity in photo-aged skin: a randomized, controlled, clinical study.. Nutr Res Pract. 2024. PMID 38854476. DOI 10.4162/nrp.2024.18.3.357. (abstract)
- Pu SY, Huang YL, Pu CM, Kang YN, Hoang KD et al.. Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis.. Nutrients. 2023. PMID 37432180. DOI 10.3390/nu15092080. (abstract)
- Rahman A, Rehmani R, Pirvu DG, Huang SM, Puri S et al.. Unlocking the Therapeutic Potential of Marine Collagen: A Scientific Exploration for Delaying Skin Aging.. Mar Drugs. 2024. PMID 38667776. DOI 10.3390/md22040159. (abstract)
- Sakaguchi M, Toda M, Ebihara T, Irie S, Hori H et al.. IgE antibody to fish gelatin (type I collagen) in patients with fish allergy.. J Allergy Clin Immunol. 2000. PMID 10984381. DOI 10.1067/mai.2000.108499. (abstract)
- Simental-Mendia M, Ortega-Mata D, Acosta-Olivo CA, Simental-Mendia LE, Pena-Martinez VM. Effect of collagen supplementation on knee osteoarthritis: an updated systematic review and meta-analysis of randomised controlled trials.. Clin Exp Rheumatol. 2025. PMID 39212129. DOI 10.55563/clinexprheumatol/kflfr5. (abstract)
- Ueno R, Takaoka Y, Shimojo N, Ohno F, Yamaguchi T et al.. A case of pediatric anaphylaxis caused by gummy tablets containing fish collagen.. Asia Pac Allergy. 2020. PMID 33178560. DOI 10.5415/apallergy.2020.10.e35. (abstract)
- Wai CYY, Leung NYH, Leung ASY, Fusayasu N, Sato S et al.. Differential patterns of fish sensitization in Asian populations: Implication for precision diagnosis.. Allergol Int. 2023. PMID 37032258. DOI 10.1016/j.alit.2023.03.003. (abstract)
- de Miranda RB, Weimer P, Rossi RC. Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis.. Int J Dermatol. 2021. PMID 33742704. DOI 10.1111/ijd.15518. (abstract)
- . NCCIH: Collagen (page not found). . . (not-read)
Where to buy
Check the label first. Whatever you buy, look for these:
- The amount of the active ingredient per serving, not just the front-label claim
- A third-party testing mark (USP, NSF or ConsumerLab)
- Other ingredients and allergens
- Ask a pharmacist about interactions with your medicines
Talk to a pharmacist or doctor before you start any supplement, especially if you take medicines. See the Safety tab for interactions.
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