Natural Ingredients · Food ingredient
Cacao & Cocoa
Theobroma cacao · also called Cacao, cocoa, cocoa flavanols, theobromine
Cacao and cocoa come from the seeds of the cacao tree. They are foods for most people, but chocolate and cocoa are poisonous to dogs and other pets, and can carry lead and cadmium plus caffeine. Trials of flavanol-rich cocoa show a small drop in blood pressure; one big trial of an extract did not significantly cut heart events. Several studies are linked to cocoa companies.
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 Cacao & Cocoa
Cacao and cocoa are food ingredients from Theobroma cacao. The main cautions are toxicity to pets, lead and cadmium in some products, and caffeine. Benefits for blood pressure are small; heart and brain benefits are not established.
What cacao and cocoa are
Cacao (Theobroma cacao, mallow family) is a tree whose beans are made into nibs, cocoa powder, cocoa butter and chocolate. US rules define cacao nibs, breakfast cocoa (22% or more cacao fat) and cocoa (10% to under 22%) separately and allow alkali treatment. We found no source defining "raw cacao".
Cocoa beans contain flavanols and the stimulants theobromine and caffeine. Processing changes how much of each remains.
What the research shows
Pooled trials of flavanol-rich cocoa products show a small blood pressure drop, about 2 mmHg on average, with moderate-certainty evidence. Blood vessel function tests also improve a little.
The largest trial (21,442 older adults) gave a cocoa extract capsule for about 3.6 years: total heart and blood vessel events were not significantly different from placebo, heart deaths were lower, and the capsules came from Mars Edge. A 3-year memory trial of the same extract found no effect, and one small trial found no effect on insulin sensitivity.
Who paid for the studies
Several studies are linked to cocoa companies: Mars Edge supplied the trial extract, Mars employees co-wrote a blood sugar trial, and the 2026 blood pressure review authors work for a cocoa-food company. The Cochrane review found a slightly smaller effect when trials with industry-employed authors were removed.
At a glance
Traditional uses history, not proof
- No traditional use could be verified from the sources we read
Studied for research
- Blood pressure: small drop, moderate certainty
- Heart events: one large extract trial, mixed
- Vessel function: small improvement, low certainty
- Thinking and memory: no effect in the largest trial
- Blood sugar: one small trial, no effect
Main compounds
- Flavanols (including epicatechin)
- Theobromine
- Caffeine
- Lead and cadmium (contaminants)
Common forms
- Cacao nibs
- Cocoa powder
- Dark chocolate
- Cocoa extract capsules
- Cocoa drinks
Research links: PubMed: COSMOS cocoa extract trial (2022) · PubMed: Cochrane review, cocoa and blood pressure (2017) · PubMed: Heavy metals in 72 chocolate and cocoa products (2024) · PubMed: Perspective on cadmium and lead in cocoa (2020) · PubMed: Some food toxic for pets (2009) · FDA: How much caffeine is too much · Research Library · Genes & Biomarkers Library
What it is and its history
- Accepted scientific name
- Theobroma cacao L.
- Naming authority
- L.
- Common names
- Cacao (English); Cocoa (English)
- Family or group
- Malvaceae (mallow family)
- Classification
- Plantae > Malvaceae > Theobroma > Theobroma cacao
- Native range
- Not verified
- Habitat
- Not verified
- What it looks like
- Roots: Not verified; Stems: Not verified; Leaves: Not verified; Flowers: Not verified; Fruit: The beans (seeds) are the part used.
- Cultivation
- Not verified
- Harvest and processing
- Beans are cured, cleaned, dried and cracked to make nibs (US definition); processing develops colour, taste and flavour but changes flavanol and methylxanthine levels (review).
- Sustainability and conservation
- Not verified
Traditional use and history history, not clinical proof
| Tradition or era | Documented use | Source |
|---|---|---|
| Modern food regulation (US) | US rules define cacao nibs, breakfast cocoa (22% or more cacao fat) and cocoa (10% to under 22%), and allow alkali treatment. | s-cfr163 |
| Processing | Raw beans are bitter and astringent; processing develops colour, taste and flavour (2022 review). | p36430843 |
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 |
|---|---|---|---|---|
| Flavanols (including epicatechin) | flavanols | Bean Varies by processing; the COSMOS extract gave 500 mg flavanols a day including 80 mg epicatechin | Studied for effects on blood pressure and blood vessel function 11 5 | Human trials |
| Theobromine | methylxanthines | Bean Cocoa beans 1 to 2% (veterinary review citing Merck manual); 3 to 10 times the caffeine in chocolate | Mild stimulant; toxic to dogs 7 5 | Review |
| Caffeine | methylxanthines | Bean Not given in sources read | Stimulant; FDA lists chocolate as a source 17 7 | Regulator |
Mechanisms, receptors and pathways
| Target or pathway | Gene or receptor | What was found | Level |
|---|---|---|---|
| Nitric oxide and blood vessel relaxation | Flavanols are thought to increase endothelial nitric oxide, helping vessels relax; both flavanols and theobromine seem involved in nitric oxide and neurotrophin regulation. 9 5 | Review | |
| Fatty acid and energy metabolism; protein kinases and antioxidant pathways | Review says theobromine acts through fatty acid, mitochondrial and energy metabolism pathways, flavanols through protein kinase and antioxidant pathways. 5 | In vitro / review |
Absorption, metabolism and elimination
- Absorption
- No human data read.
- Distribution
- No data.
- Metabolism
- Animals that break theobromine down more slowly are easily poisoned (veterinary review).
- Elimination
- No data.
- Bioavailability
- Not established.
Isolated compounds versus whole extracts
The COSMOS trial used a standardized extract; the blood pressure trials used cocoa products with different flavanol content. Ordinary chocolate and cocoa drinks vary a lot and were not tested as a group.
Nutritional composition
Cocoa products are foods; nutrient tables, sugar and fat in chocolate were not read here.
1 moderate certainty2 low certainty1 very low certainty1 not enough evidence1 evidence against
What was looked at
The 6 benefits and uses checked for Cacao & Cocoa, each with how strong the evidence is. Tap one to open it.
- Blood pressureModerate certainty
- Heart attacks, strokes and heart deathsLow certainty
- Blood vessel function (flow-mediated dilation)Low certainty
- Thinking and memoryEvidence against
- Blood sugar control and insulin resistanceVery low certainty
- Mood, weight loss, skin, general "antioxidant" claimsNot enough evidence
Lab markers tracked in the studies
Blood pressure (systolic and diastolic)Flow-mediated dilation (FMD)Global cognition composite scoreHOMA-IR (insulin resistance index)
What is Cacao & Cocoa good for?
The uses people ask about and how strong the human evidence is for each. Most results come from cocoa extracts or flavanol-rich products, not everyday chocolate.
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.
Blood pressure
Moderate certaintyFlavanol-rich cocoa products lower blood pressure by a small amount in short trials, about 2 mmHg on average. The effect is small and the trials differ a lot.
2 studiesFlavanol-rich cocoa products and cocoa extracts; the trials used very…
Studies, doses and limits
What the trials found
Cochrane review (Ried 2017): 35 trials, 1,804 mainly healthy adults, 2 to 18 weeks: systolic -1.76 mmHg and diastolic -1.76 mmHg. Bigger drop in people with high blood pressure; no significant drop in people with normal blood pressure (borderline difference). Removing trials with industry-employed authors slightly reduced the effect. Updated review (Sakuda 2026): 25 trials, 1,167 people: systolic -2.73 and diastolic -1.85 mmHg.
Results
A small average drop with flavanol-rich cocoa products.
Effect sizes as reported
Systolic about -1.8 to -2.7 mmHg; diastolic about -1.8 to -1.9 mmHg
Why this rating
Cochrane rated it moderate quality (unexplained differences between trials, possible reporting bias); the 2026 review rated systolic certainty moderate. Effect is small and short-term.
Form and dose studied
Flavanol-rich cocoa products and cocoa extracts; the trials used very different products and amounts. A normal chocolate bar or cocoa drink may have far less flavanol.
Who was studied
Mainly healthy adults; larger effect in people with high blood pressure.
Limits
Short trials (mean about 9 weeks). Control products differed. Some trial authors worked for industry; the 2026 review authors work for a cocoa-food company. Not a substitute for blood pressure treatment.
Why researchers looked
Cocoa flavanols are studied for effects on blood vessels.
Traditional use
No source we could read documents traditional use by named peoples, so none is described.
Proposed mechanism Proposed mechanism
Flavanols (a group of plant compounds in cocoa) are thought to help blood vessels relax through nitric oxide; this is a proposed mechanism from lab and review work, not proven as the cause in people (Cochrane review; 2022 review).
A proposed mechanism does not show that the effect happens in people.
Cochrane reported gut complaints and nausea in about 1% on cocoa and 0.4% on control. Also see the caffeine and metals points on the Safety tab.
Heart attacks, strokes and heart deaths
Low certaintyThe largest trial gave older adults a cocoa extract capsule for about 3.6 years. Total heart and blood vessel events did not differ significantly from placebo, though deaths from heart disease were lower.
1 studiesStandardized cocoa extract capsule (not chocolate, cocoa powder or a …
Studies, doses and limits
What the trials found
COSMOS (Sesso 2022): 21,442 US adults (women 65+, men 60+); cocoa extract with 500 mg flavanols a day (80 mg epicatechin) vs placebo, median 3.6 years. Total cardiovascular events HR 0.90 (95% CI 0.78 to 1.02), not significant. Cardiovascular death HR 0.73 (0.54 to 0.98) (a secondary endpoint). Per-protocol analysis HR 0.85 (0.72 to 0.99). All-cause death HR 0.89 (0.77 to 1.03). No safety concerns reported.
Results
Main result not significant; fewer heart deaths and a possible benefit in people who kept taking the capsules.
Effect sizes as reported
Total events HR 0.90; CVD death HR 0.73; per-protocol HR 0.85
Why this rating
One large trial; the main (primary) result missed statistical significance; the CVD-death finding was secondary and the per-protocol analysis is less reliable. The study capsules were supplied by Mars Edge. A trial of an extract, not chocolate.
Form and dose studied
Standardized cocoa extract capsule (not chocolate, cocoa powder or a drink).
Who was studied
Older adults free of major heart disease and recent cancer; mostly US participants.
Limits
Cannot be applied to chocolate bars or drinks. The authors say more research is needed.
Why researchers looked
Earlier small trials suggested flavanols improve blood-vessel measures, but actual heart events had not been tested.
Traditional use
No source we could read documents traditional use by named peoples, so none is described.
Proposed mechanism Proposed mechanism
Flavanols (a group of plant compounds in cocoa) are thought to help blood vessels relax through nitric oxide; this is a proposed mechanism from lab and review work, not proven as the cause in people (Cochrane review; 2022 review).
A proposed mechanism does not show that the effect happens in people.
Authors reported no safety concerns in this trial.
Blood vessel function (flow-mediated dilation)
Low certaintyCocoa flavanols slightly improve a test of how well arteries widen. This is a lab-style measure of vessel health, not proof of fewer heart problems.
3 studiesHigh-flavanol cocoa products with known flavanol content.
Studies, doses and limits
What the trials found
Meta-analysis (Sun 2019): 15 articles, 18 arms: FMD +1.17% (95% CI 0.76 to 1.57), inverted-U pattern with amount, much unexplained variation and risk-of-bias concerns. Updated meta-analysis (Sakuda 2026): FMD +1.31% (1.04 to 1.59) and a tiny improvement in pulse wave velocity (-0.20 m/s); certainty for these outcomes was limited.
Results
Small improvement in vessel-function tests.
Effect sizes as reported
FMD about +1.2 to +1.3 percentage points
Why this rating
Substantial unexplained variation, risk-of-bias concerns, and the outcome is a test, not an illness. EFSA opinion not read directly.
Form and dose studied
High-flavanol cocoa products with known flavanol content.
Who was studied
Healthy adults and adults with some risk factors.
Limits
Everyday chocolate may not match the products tested. The EFSA claim is about a defined test, not about preventing disease.
Why researchers looked
Blood vessel lining (endothelium) health is thought to link to heart risk.
Traditional use
The EU food safety body EFSA reportedly accepted a link between 200 mg of cocoa flavanols a day and normal blood flow, after an application by a chocolate maker; we read only a trade-press report of that opinion.
Proposed mechanism Proposed mechanism
Flavanols (a group of plant compounds in cocoa) are thought to help blood vessels relax through nitric oxide; this is a proposed mechanism from lab and review work, not proven as the cause in people (Cochrane review; 2022 review).
A proposed mechanism does not show that the effect happens in people.
None specific.
Thinking and memory
Evidence againstA 3-year trial of cocoa extract in older adults found no effect on thinking and memory tests.
1 studiesCocoa extract capsule.
Studies, doses and limits
What the trials found
COSMOS-Mind (Baker 2023): 2,262 older adults (mean age 73), cocoa extract with 500 mg flavanols a day vs placebo for 3 years: no effect on global cognition (mean z-score 0.03, 95% CI -0.02 to 0.08, P = 0.28).
Results
No benefit found.
Effect sizes as reported
Difference 0.03 (CI -0.02 to 0.08)
Why this rating
A large, well-designed trial found no effect; shorter small trials of single servings exist but were not reviewed.
Form and dose studied
Cocoa extract capsule.
Who was studied
Older adults, mostly non-Hispanic White; tests done by telephone.
Limits
Tested capsules, not chocolate; one trial. A separate multivitamin arm showed a small benefit, which is a different question.
Why researchers looked
Flavanols were proposed to protect the brain through blood-vessel and nerve-growth pathways.
Traditional use
No source we could read documents traditional use by named peoples, so none is described.
Proposed mechanism Proposed mechanism
Proposed pathways include nitric oxide and neurotrophin regulation (2022 review); not shown to work in this trial.
A proposed mechanism does not show that the effect happens in people.
None specific.
Blood sugar control and insulin resistance
Very low certaintyOne small 4-week trial of a high-flavanol cocoa drink in women with overweight or obesity found no improvement in insulin sensitivity.
1 studiesHigh-flavanol cocoa drink.
Studies, doses and limits
What the trials found
Simpson 2023: 32 premenopausal women with overweight or obesity and raised HOMA-IR; high-flavanol (609 mg per serving, two servings a day) vs low-flavanol cocoa drink for 4 weeks: no difference in fasting insulin sensitivity or insulin-mediated glucose uptake.
Results
No difference found.
Effect sizes as reported
No significant difference
Why this rating
Only one very small, short trial, and it was negative. Authors say a recommendation to use cocoa flavanols for blood sugar control is not established.
Form and dose studied
High-flavanol cocoa drink.
Who was studied
Premenopausal women, overweight or obese.
Limits
Small trial (32); authors include Mars employees.
Why researchers looked
Cocoa flavanols were proposed to improve how the body responds to insulin.
Traditional use
No source we could read documents traditional use by named peoples, so none is described.
Proposed mechanism Preliminary mechanism
Not established.
A proposed mechanism does not show that the effect happens in people.
Chocolate and cocoa products often contain sugar and fat; read labels.
Mood, weight loss, skin, general "antioxidant" claims
Not enough evidenceWe did not find trials we could read that back these claims, so we cannot say whether they hold.
0 studiesNot applicable
Studies, doses and limits
What the trials found
No human trials on these outcomes were read for this page.
Results
Not assessed.
Why this rating
We searched for the main studied uses only; these claims were not reviewed.
Limits
No evidence to judge benefit.
Why researchers looked
Popular claims for cocoa and chocolate.
Traditional use
No source we could read documents traditional use by named peoples, so none is described.
Proposed mechanism Not assessed
Not assessed.
A proposed mechanism does not show that the effect happens in people.
None specific.
Connections to the rest of health
How Cacao & Cocoa 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 |
|---|---|---|---|---|
| Blood Pressure Support | Moderate certainty | Blood pressure: Flavanol-rich cocoa products lower blood pressure by a small amount in short trials, about 2 mmHg on average. The effect is small and the trials differ a lot. | 9 10 | |
| Heart Health | Moderate certainty | Blood pressure: Flavanol-rich cocoa products lower blood pressure by a small amount in short trials, about 2 mmHg on average. The effect is small and the trials differ a lot. Heart attacks, strokes and heart deaths: The largest trial gave older adults a cocoa extract capsule for about 3.6 years. Total heart and blood vessel events did not differ significantly from placebo, though deaths from heart disease were lower. | 9 10 11 13 8 | |
| Healthy Circulation | Low certainty | Blood vessel function (flow-mediated dilation): Cocoa flavanols slightly improve a test of how well arteries widen. This is a lab-style measure of vessel health, not proof of fewer heart problems. | 13 10 8 | |
| Memory Support | Evidence against | Thinking and memory: A 3-year trial of cocoa extract in older adults found no effect on thinking and memory tests. | 3 | |
| Brain Health | Evidence against | Thinking and memory: A 3-year trial of cocoa extract in older adults found no effect on thinking and memory tests. | 3 | |
| Blood Sugar Balance | Very low certainty | Blood sugar control and insulin resistance: One small 4-week trial of a high-flavanol cocoa drink in women with overweight or obesity found no improvement in insulin sensitivity. | 12 | |
| Metabolic Health | Very low certainty | Blood sugar control and insulin resistance: One small 4-week trial of a high-flavanol cocoa drink in women with overweight or obesity found no improvement in insulin sensitivity. | 12 | |
| Mood Balance | Not enough evidence | Mood, weight loss, skin, general "antioxidant" claims: We did not find trials we could read that back these claims, so we cannot say whether they hold. |
B. Body systems
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Cardiovascular System | Biological association | Moderate certainty | Studied for: Blood pressure Studied for: Heart attacks, strokes and heart deaths | 9 10 11 13 8 |
| Nervous System | Biological association | Evidence against | Studied for: Thinking and memory Studied for: Mood, weight loss, skin, general "antioxidant" claims | 3 |
| Endocrine System | Biological association | Very low certainty | Studied for: Blood sugar control and insulin resistance | 12 |
I. Biomarkers
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Blood pressure (systolic and diastolic) | Biological association | Moderate certainty | Measured in trials: lowered. A lab change is not the same as a health benefit. | 9 10 |
| Flow-mediated dilation (FMD) | Biological association | Low certainty | Measured in trials: raised. A lab change is not the same as a health benefit. | 13 10 |
| Global cognition composite score | Biological association | Moderate certainty | Measured in trials: unchanged. A lab change is not the same as a health benefit. | 3 |
| HOMA-IR (insulin resistance index) | Biological association | Very low certainty | Measured in trials: unchanged. A lab change is not the same as a health benefit. | 12 |
K. Biological pathways
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Nitric oxide signalling | Preliminary mechanism | Review | Proposed route for flavanol effects on vessels. | 5 |
L. Active compounds
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Theobromine | Moderate certainty | Main toxic agent for dogs, with caffeine. Preparation or compound: Cocoa and chocolate |
7 | |
| Caffeine | Moderate certainty | FDA lists chocolate as a caffeine source. Preparation or compound: Cocoa and chocolate |
17 | |
| Flavanols (including epicatechin) | Biological association | Human trials | Studied for effects on blood pressure and blood vessel function Preparation or compound: Bean |
11 5 |
| Theobromine | Biological association | Review | Mild stimulant; toxic to dogs Preparation or compound: Bean |
7 5 |
| Caffeine | Biological association | Regulator | Stimulant; FDA lists chocolate as a source Preparation or compound: Bean |
17 7 |
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 30, 2026).
Evidence at a glance: what changed in 2 lab markers
Tap a number to show only those markers. Counts are markers, not people.
The evidence
The research centre for Cacao & Cocoa. 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 re-read PubMed abstracts (and full text where noted) for the main studies, read the US FDA caffeine page and the US cacao product rules, and checked the plant name against GBIF.
Study library: every study we checked 17
| Study | Design | People | Product, dose, length | Result |
|---|---|---|---|---|
| Abt 2020 Perspective on Cadmium and Lead in Cocoa and Chocolate J Agric Food Chem · PMID 32293881 · DOI |
Narrative review n/a |
Cocoa and chocolate products | Cocoa and chocolate can contain cadmium and lead from natural and human-made sources. Cadmium is higher in some cocoa and chocolate from parts of Latin America, linked to elevated soil cadmium. Work continues internationally to lower levels; more work is needed to find successful ways to do so. Methods, limits and fundingOutcomes: Cadmium and lead Limitations: A perspective by US FDA scientists: no new measurements in the abstract. Funding and conflicts: Authors are at US FDA (CFSAN). No outside funding stated in the abstract. Read: abstract | |
| Avasarala 2026 Dark chocolate, heavy metals, and neurodevelopment in children Food Chem Toxicol · PMID 41101683 · DOI |
Opinion review n/a |
Short communication on children | Argues that many dark chocolates contain measurable lead and cadmium, often more than milk or white chocolate, and calls for clearer food safety labelling for children, citing the American Heart Association statement on unequal exposure. Methods, limits and fundingOutcomes: Lead and cadmium in dark chocolate Limitations: Short opinion piece, not new data. Funding and conflicts: No competing interests declared. Read: abstract | |
| Baker 2023 Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial (COSMOS-Mind) Alzheimers Dement · PMID 36102337 · DOI |
Controlled trial |
2262 Older US adults, mean age 73, 60% women, 3 years |
Cocoa extract had no effect on global cognition. (The multivitamin arm, a separate question, did show a small benefit.) Cocoa extract mean z-score difference 0.03 (-0.02 to 0.08 (P = 0.28)) Methods, limits and fundingOutcomes: Global cognition composite (telephone tests) Limitations: Mostly non-Hispanic White; tests done by telephone; tested extract capsules, not chocolate. Funding and conflicts: NIA-funded; the paper states NIH, Mars and Pfizer did not contribute to design, conduct, analysis or writing. Mars Edge supplied the COSMOS cocoa extract. INDUSTRY-LINKED supply. Read: abstract | |
| GBIF 2026 GBIF Backbone Taxonomy: Theobroma cacao L. (usageKey 3152205) gbif.org · Source |
Reference database n/a |
Accepted name Theobroma cacao L., family Malvaceae, genus Theobroma. Methods, limits and fundingOutcomes: Accepted name and family Limitations: Name check only; read through the GBIF API on 2026-10-30. Funding and conflicts: Not applicable Read: database record | ||
| Goya 2022 From Cocoa to Chocolate: Effect of Processing on Flavanols and Methylxanthines and Their Mechanisms of Action Int J Mol Sci · PMID 36430843 |
Narrative review mixed |
Review of cocoa processing and composition | Raw cocoa beans are high in polyphenols and methylxanthines, which add bitterness and astringency; processing develops colour, taste and flavour but changes the amounts of these compounds. More data are needed on each processing step. Mechanism section: theobromine acts on fatty acid and energy metabolism pathways; flavanols mainly on protein kinase and antioxidant pathways; both appear involved in nitric oxide and neurotrophin regulation. Methods, limits and fundingOutcomes: Processing effects on polyphenols (flavanols) and methylxanthines (theobromine, caffeine) Limitations: Narrative review; mechanisms are largely lab work. No amounts read from the abstract. Funding and conflicts: Not stated in the abstract read Read: abstract (Europe PMC) | |
| Hands 2024 A multi-year heavy metal analysis of 72 dark chocolate and cocoa products in the USA Front Nutr · PMID 39144282 · DOI |
Lab analysis n/a |
72 72 US consumer dark chocolate and cocoa products bought 2014 to 2022 |
43% of products exceeded the Prop 65 maximum allowable dose level for lead and 35% for cadmium (per daily serving use); none for arsenic. 97.2% (70 of 72) were below FDA's interim reference level for lead. Median concentrations were below the limits, so a few high outliers drive the picture. Products labelled organic were significantly more likely to have higher cadmium and lead. 43% over lead limit; 35% over cadmium limit; 0% arsenic Methods, limits and fundingOutcomes: Lead, cadmium and arsenic content compared with California Prop 65 limits and FDA interim reference level for lead Limitations: Products were bought by a testing company and not randomly sampled; limits are daily-dose limits, so results depend on serving size. No health outcomes measured. Funding and conflicts: Three authors were employed by ConsumerLab.com, the testing company; authors declare no other conflicts. Read: abstract | |
| Kovalkovicova 2009 Some food toxic for pets Interdiscip Toxicol · PMID 21217849 · DOI |
Narrative review dog, cat, horse (review) |
Foods harmful to dogs and cats (including chocolate) | Chocolate comes from the roasted seeds of Theobroma cacao; its toxic principles are the methylxanthines theobromine and caffeine. Chocolate toxicoses may cause life-threatening heart rhythm problems and central nervous system effects. Chocolate is toxic to all species, especially small dogs. Darker, cocoa-richer products are more dangerous: cocoa powder and cooking chocolate are the most toxic forms, milk chocolate less so, white chocolate an insignificant source. The review says the theobromine in chocolate is small enough that humans can eat chocolate in large quantities, but animals that break theobromine down more slowly can easily eat enough to be poisoned. Cocoa bean hulls used as bedding have poisoned horses. Theobromine concentration is 3 to 10 times that of caffeine in chocolate. Methods, limits and fundingOutcomes: Chocolate toxicosis in pets Limitations: Veterinary review citing the Merck Veterinary Manual; dated 2009. Full text read on Europe PMC. Funding and conflicts: Not stated Read: abstract + full text (Europe PMC, PMC2984110) | |
| Nutritional Outlook 2012 EU Health Claim for Cocoa Flavanols and Blood Flow (trade-press report of EFSA Journal 2012;10(7):2809) nutritionaloutlook.com · Source |
Trade press report n/a |
Reports that EFSA linked 200 mg of cocoa flavanols a day (about 2.5 g of high-flavanol cocoa powder or 10 g of high-flavanol dark chocolate) with normal blood flow (endothelium-dependent vasodilation). Applicant: Barry Callebaut, a chocolate maker. Methods, limits and fundingLimitations: Secondary report: the EFSA opinion itself returned 403 and was not read. Whether the claim is authorised in the EU was not checked. Funding and conflicts: Applicant was a chocolate maker (Barry Callebaut). INDUSTRY-LINKED. Read: trade-press page (summary-only for EFSA) | ||
| Ried 2017 Effect of cocoa on blood pressure Cochrane Database Syst Rev · PMID 28439881 · DOI |
Systematic review meta analysis |
1804 Mainly healthy adults; 35 trials (40 treatment comparisons), 2 to 18 weeks |
Flavanol-rich cocoa products lowered blood pressure slightly compared with control. Larger drop in people with high blood pressure, none significant in people with normal blood pressure (borderline subgroup difference). Excluding trials with authors employed by sponsoring industry slightly reduced the effect, suggesting some reporting bias. Quality of evidence moderate. Gut complaints and nausea in about 1% on cocoa vs 0.4% on control. Systolic -1.76 mmHg; diastolic -1.76 mmHg (Systolic -3.09 to -0.43; diastolic -2.57 to -0.94) Methods, limits and fundingOutcomes: Systolic and diastolic blood pressure Limitations: Unexplained differences between trials; short follow-up (mean about 9 weeks); trials gave 30 to 1218 mg flavanols a day in 1.4 to 105 g of cocoa products. Funding and conflicts: Cochrane review; authors state no conflicts other than two being investigators on included trials. Read: abstract | |
| Sakuda 2026 Impact of cocoa flavanols on blood pressure and vascular function: an updated systematic review and meta-analysis of randomized controlled trials J Nutr Health Aging · PMID 42679502 · DOI |
Systematic review meta analysis |
1167 25 randomized trials in hypertensive and normotensive adults; searches up to December 2025 |
Cocoa flavanols lowered systolic and diastolic blood pressure and slightly improved flow-mediated dilation and pulse wave velocity; no change in ankle-brachial index (two studies). Certainty was moderate for systolic blood pressure and limited for the other outcomes. Systolic -2.73 mmHg; diastolic -1.85 mmHg; FMD +1.31%; PWV -0.20 m/s (Systolic -3.45 to -2.02; diastolic -2.73 to -0.97; FMD 1.04 to 1.59; PWV -0.39 to -0.007) Methods, limits and fundingOutcomes: Blood pressure, flow-mediated dilation, pulse wave velocity, ankle-brachial index Limitations: Pooled trials of many products and amounts (10.6 to 1,680 mg flavanols a day); vascular outcomes had limited certainty. Funding and conflicts: Authors are employees of Meiji Co., Ltd., which develops cocoa-containing foods, and a marketing consultancy; they state the company had no role in the specific products studied. INDUSTRY-LINKED authors. Registration: UMIN000059995 Read: abstract | |
| Sesso 2022 Effect of cocoa flavanol supplementation for the prevention of cardiovascular disease events: the COcoa Supplement and Multivitamin Outcomes Study (COSMOS) randomized clinical trial Am J Clin Nutr · PMID 35294962 · DOI |
Controlled trial |
21442 US adults: women 65 and over, men 60 and over, free of major heart disease and recent cancer |
Median 3.6 years follow-up. Total cardiovascular events: 410 with cocoa extract vs 456 with placebo, not significantly different. Cardiovascular death was lower with cocoa extract. Per-protocol analysis (counting only time while taking the capsules) supported fewer total events. The authors reported no safety concerns. Total events HR 0.90; CVD death HR 0.73; per-protocol total events HR 0.85 (Total events 95% CI 0.78 to 1.02 (P = 0.11); CVD death 0.54 to 0.98; per-protocol 0.72 to 0.99) Methods, limits and fundingOutcomes: Total cardiovascular events (heart attack, stroke, revascularization, cardiovascular death and others) Limitations: Tested a standardized cocoa extract capsule, not chocolate or cocoa powder. The main result was not statistically significant; CVD death was a secondary endpoint. Cocoa extract capsules and capsule packaging were supplied by Mars Edge, which also gave investigator-initiated grants for infrastructure (full text, funding statement). Funding and conflicts: Main funding: NIH (per full text); cocoa extract and placebo pills donated by Mars Edge (part of Mars Incorporated), plus investigator-initiated grants from Mars Edge. INDUSTRY-LINKED. Registration: NCT02422745 Read: abstract + full text (Europe PMC, PMC9170467) | |
| Simpson 2023 Cocoa Flavanol Supplementation and the Effect on Insulin Resistance in Females Who Are Overweight or Obese: A Randomized, Placebo-Controlled Trial Nutrients · PMID 36771271 · DOI |
Controlled trial |
32 Premenopausal women with overweight or obesity and raised HOMA-IR; 4 weeks |
High-flavanol cocoa drink did not change fasting insulin sensitivity or insulin-mediated glucose uptake compared with a low-flavanol cocoa drink. The authors say a recommendation for cocoa flavanols to improve blood sugar control is not established. No difference between groups (not given in the abstract) Methods, limits and fundingOutcomes: Insulin sensitivity (HOMA-IR) and insulin-mediated glucose uptake Limitations: Only 32 women, 4 weeks; the comparison drink was also cocoa (low flavanol). Funding and conflicts: Two authors are employed by Mars, Incorporated, and had input in study design; a third has advised Mars Wrigley and others. INDUSTRY-LINKED. Read: abstract | |
| Sun 2019 Dose-response relationship between cocoa flavanols and human endothelial function: a systematic review and meta-analysis of randomized trials Food Funct · PMID 31524216 · DOI |
Systematic review meta analysis |
15 articles, 18 intervention arms | Cocoa flavanols raised flow-mediated dilation, with an inverted-U relationship to amount (more was not always better). Considerable unexplained variation. FMD +1.17% (0.76% to 1.57%) Methods, limits and fundingOutcomes: Flow-mediated dilation (a blood vessel function test) Limitations: Substantial unexplained variation and significant risk-of-bias concerns in most studies; one database searched. FMD is a test of vessel function, not a clinical outcome. Funding and conflicts: Not stated in the abstract read; author affiliations and funding were not checked, so industry links are unknown. Read: abstract | |
| Thornton 2026 Analytical measurement and human health risk assessment of selected metals from commercial chocolate bars Food Chem Toxicol · PMID 41692062 · DOI |
Lab analysis n/a |
36 36 milk and dark chocolate samples from six brands |
No non-cancer risk at typical intake. At high-end intake there was potential non-cancer risk from lead in most age groups. Arsenic was found in only two samples. The authors conclude risk from heavy metals is unlikely under typical scenarios for most chocolate bars. Methods, limits and fundingOutcomes: Arsenic, cadmium, lead, mercury; health-risk comparison by age Limitations: Small sample (36 bars, six brands); risk assessment by modelling. Funding and conflicts: All authors are/were employed by Stantec Consulting, Inc.; no outside funding stated. Read: abstract | |
| Thornton 2026 Probabilistic biokinetic lead modeling to quantify relative contribution of chocolate bar intake to blood lead levels Food Chem Toxicol · PMID 41592635 · DOI |
Modelling n/a |
US EPA All-Ages Lead Model, scenarios by age | At typical US intake chocolate contributed about 0.3 to 0.8% of total lead intake and 0.5 to 0.7% of blood lead; at plausible high-end intake (about half to three-quarters of a full-size bar daily) about 3.1 to 6.5% of blood lead levels. Soil and dust dominated for young children (about 37% and 51% of the variance; chocolate about 0.1%). Methods, limits and fundingOutcomes: Share of blood lead attributable to chocolate Limitations: A computer model, not a measurement in people. Funding and conflicts: All authors are/were employed by Stantec Consulting, Inc.; no outside funding stated. Industry funding not stated, but authors are consultants. Read: abstract | |
| US Food and Drug Administration / eCFR 2026 21 CFR Part 163 Subpart B, Cacao Products (eCFR) ecfr.gov · Source |
Regulator document n/a |
Cacao nibs: the food prepared by removing the shell from cured, cleaned, dried and cracked cacao beans (shell not more than 1.75% by weight). Breakfast cocoa: made from ground cacao nibs after part of the cacao fat is removed; not less than 22% cacao fat. Cocoa (or medium fat cocoa): same standard but less than 22% and not less than 10% cacao fat. Nibs and cocoa may be processed with approved alkali ingredients. Methods, limits and fundingOutcomes: US legal definitions of cacao products Limitations: US definitions only; other countries use different rules. The term "raw cacao" is not defined in the text read. Funding and conflicts: Regulator document Read: full text (eCFR API) | ||
| US Food and Drug Administration 2024 Spilling the Beans: How Much Caffeine Is Too Much? fda.gov consumer update · Source |
Regulator document n/a |
General public | Lists chocolate among well-known caffeine sources. Cites 400 milligrams a day as an amount not generally associated with dangerous negative effects for most healthy adults. Advises people who are pregnant, trying to become pregnant or breastfeeding to talk to a health care provider about whether to limit caffeine. Gives 113 to 247 mg per 12-ounce serving of regular brewed coffee. Does not give a figure for chocolate or cocoa. Methods, limits and fundingOutcomes: Caffeine sources and limits Limitations: General caffeine page, not specific to cocoa; page current as of 2024-08-28. Funding and conflicts: Regulator page Read: full-text page |
What we do not know yet
- Only one large trial of heart events, and it tested an extract capsule, not chocolate.
- No source read gave caffeine or theobromine content of cocoa products.
- No medicine interaction, pregnancy, breastfeeding or child study for cocoa was read.
- Heavy-metal modelling studies come from one consulting firm; independent work is needed.
- Traditional use was not documented in the sources we could read.
How new research is added
New studies are found by a saved PubMed search and placed into the data files, then this page is rebuilt.
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
Blood pressure (systolic and diastolic)
Lowered in trials
Pressure in the arteries when the heart beats and rests.
Moderate certaintyFlow-mediated dilation (FMD)
Raised in trials
An ultrasound test of how much an artery widens after a brief blood-flow block; a measure of blood vessel lining function.
Low certaintyGlobal cognition composite score
Unchanged in trials
Average of standardised scores from several memory and thinking tests.
Moderate certaintyResults and what it means
Why it was measured
Primary outcome of COSMOS-Mind.
Statistical vs. clinical meaning
No effect.
Safety implication
None.
| Study | Result | People | Product |
|---|
HOMA-IR (insulin resistance index)
Unchanged in trials
A calculation from fasting glucose and insulin that estimates insulin resistance.
Very low certaintyResults and what it means
Why it was measured
Primary outcome of the small 4-week trial.
Statistical vs. clinical meaning
Small trial, no change.
Safety implication
None.
| Study | Result | People | Product |
|---|
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 4
- Dogs and other pets: chocolate and cocoa can poison them. Chocolate is toxic to all species, especially small dogs. The toxic parts are theobromine and caffeine, and poisoning can cause life-threatening heart rhythm problems and brain and nerve effects. Dark chocolate, cooking chocolate and cocoa powder are the most dangerous; milk chocolate less so; white chocolate is an insignificant source. Cocoa bean hulls used as bedding have poisoned horses. If a pet has eaten any, call a vet or animal poison service straight away; do not wait for signs. Review 7
- Lead and cadmium can be present in cocoa and chocolate. Cocoa and chocolate can contain lead and cadmium from soil and from human sources, with higher cadmium in some cocoa from parts of Latin America. In one analysis of 72 US dark chocolate and cocoa products, 43% were above California Prop 65 limits for lead and 35% for cadmium per daily serving, though 97.2% were below the FDA interim reference level for lead. Organic-labelled products were more likely to be higher. Sources disagree on how worried to be, and children and heavy daily eaters are the groups to think about. Lab analysis 1 6 15 14 2
- Cocoa contains caffeine and theobromine. The US FDA lists chocolate as a well-known caffeine source and cites 400 mg a day as an amount not generally linked to dangerous effects in most healthy adults. It advises anyone pregnant, trying to become pregnant or breastfeeding to ask a health care provider about limiting caffeine. Theobromine, a related stimulant, is present at several times the amount of caffeine in chocolate (per a veterinary review). We did not find a source giving the caffeine content of cocoa powder or chocolate. Authoritative guidance 17 7
- The heart-health findings come from an extract, and several studies are industry-linked. The big heart trial tested a cocoa extract capsule, not chocolate, and its capsules were supplied by Mars Edge. Several other trials and reviews have authors or supply links to cocoa companies. Chocolate often also carries sugar, fat and calories. Expert opinion 11 12 10
Side effects 3
| Effect | How often | Severity and recovery | Evidence |
|---|---|---|---|
| Stomach upset and nausea Cochrane review of flavanol-rich cocoa products; moderate-quality evidence. | About 1% on cocoa vs 0.4% on control in pooled blood pressure trials | mild Presumed temporary; not studied | Systematic review 9 |
| Caffeine effects (jitters, sleep trouble, fast heartbeat) in sensitive people FDA lists chocolate as a caffeine source; specific effects of cocoa were not read. | Not given for cocoa | mild to moderate Presumed reversible | Authoritative guidance 17 |
| No safety concerns reported in the large extract trial Applies to extract capsules in older adults over 3.6 years; says nothing about heavy metals from daily chocolate. | Not applicable | not applicable Not applicable | Controlled trial 11 |
Liver
No source read described liver injury from cocoa or chocolate as a food. LiverTox was not checked for this page.
How often. Unknown. Absence of reports in sources read is not proof of safety.
Monitoring. No agency advice found. Seek care for yellow skin or eyes, dark urine or severe tiredness.
This is a safety connection. It is not evidence that Cacao & Cocoa supports liver health.
Medicines and supplements 2
| With | Why it matters | Importance | Evidence | What to do |
|---|---|---|---|---|
| Medicines and supplements sensitive to caffeine or stimulants prescription | Cocoa contains caffeine and theobromine. This general idea comes from the FDA listing chocolate as a caffeine source; no interaction with a named medicine was read. | Not studied for cocoa in the sources read. | Theory Not enough evidence 17 | Ask a pharmacist if you take medicines that are affected by caffeine. |
| Medicines for blood pressure prescription | Flavanol-rich cocoa products lower blood pressure slightly in trials. | Not tested with blood pressure medicines in the sources read; effect is small. | Theory Not enough evidence 9 | Do not use cocoa products in place of blood pressure medicine; ask your doctor if you take large amounts of cocoa extracts. |
Who should check first 4
| Situation | Advice | Evidence |
|---|---|---|
| Pets (dogs, cats, horses and others) | Keep chocolate, cocoa powder and cocoa mulch away from animals. | Review 7 |
| Pregnancy and breastfeeding | FDA advises asking a health care provider whether to limit caffeine. No cocoa-specific pregnancy or breastfeeding study was read. | Authoritative guidance 17 |
| Children | Lead and cadmium in dark chocolate are a concern raised for children in one opinion piece; no safe intake for children was read. FDA notes the Dietary Guidelines advise avoiding caffeinated drinks for children under 2. | Expert opinion 2 17 |
| Caffeine-sensitive people | Chocolate and cocoa contain caffeine; talk to a clinician if you have a heart rhythm condition, anxiety or trouble sleeping. | Authoritative guidance 17 |
Overdose, product quality and regulators
Summary. In pets, chocolate toxicosis is well described and can be fatal. In people, no toxicity from normal food amounts was read; the concerns are heavy metals and caffeine.
Animal. Dogs, cats and horses are poisoned by the theobromine and caffeine in chocolate and cocoa products; smaller animals need less. Darker chocolate and cocoa powder are the most toxic.
Human doses studied. Not assessed here.
High dose or long term signals. High-end chocolate intake (about half to three-quarters of a full-size bar daily in one model) may add noticeably to lead intake; long-term effects not measured.
Overdose response. In pets: contact a vet or animal poison control immediately.
Genotoxicity. Not tested in the sources read.
Toxic or hazardous parts. Cocoa bean hulls used as mulch or bedding are toxic to animals.
Lead and cadmium are the main contamination findings; arsenic was found in few samples.
. Higher in some cocoa from parts of Latin America, tied to elevated soil cadmium. 1
. 72 US products 2014 to 2022: 43% above Prop 65 lead dose limit, 35% above cadmium limit, none for arsenic; organic-labelled products more likely higher; most below FDA lead reference level. 6
. 36 bars from six brands: low risk under typical intake, possible lead risk at high-end intake; arsenic found in only 2 samples. 14
| Body | Action | Date |
|---|---|---|
| US Food and Drug Administration (United States) | Consumer update lists chocolate among well-known caffeine sources; 400 mg a day cited as an amount not generally linked to dangerous effects; talk to a provider if pregnant or breastfeeding. source | 2024-08-28 |
When to get medical help
- A pet has eaten chocolate, cocoa powder or cocoa mulch: call a vet or animal poison service now (veterinary sources describe stomach and bowel upset, heart rhythm problems and nervous system effects)
- Swelling of lips, face or throat, hives or breathing trouble after eating cocoa or chocolate
- Racing or irregular heartbeat, chest pain or fainting after strong caffeine intake
- Yellow skin or eyes
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
Is cacao the same as cocoa?
Not exactly on a label. US rules define "cacao nibs", "breakfast cocoa" (22% or more cacao fat) and "cocoa" (10% to under 22%) separately. "Raw cacao" is not defined in the text we read.
Is chocolate dangerous for dogs?
Yes. Chocolate is toxic to dogs and other animals, especially small dogs. Dark chocolate, cooking chocolate and cocoa powder are the most dangerous. Call a vet or animal poison service straight away if a pet has eaten any.
Why is chocolate poisonous to dogs?
It contains theobromine and caffeine. Animals break theobromine down more slowly than people, so they can eat enough to be poisoned. It can cause heart rhythm problems and nervous system effects.
Does dark chocolate contain lead and cadmium?
Is the lead in chocolate a real health risk?
Does cocoa lower blood pressure?
Is cocoa good for your heart?
One large trial of a cocoa extract capsule did not find a significant drop in total heart and blood vessel events, though heart deaths were lower. It did not test chocolate.
Does cocoa improve memory?
Not in the largest trial. A 3-year trial of cocoa extract in older adults found no effect on thinking and memory.
Does cocoa have caffeine?
Yes. The FDA lists chocolate as a well-known caffeine source. We did not find a figure for cocoa or chocolate in the sources we read.
Is cocoa safe in pregnancy and breastfeeding?
The FDA advises asking a health care provider whether to limit caffeine. We did not read a cocoa-specific study for pregnancy or breastfeeding.
Are the cocoa studies independent?
Explore by health goal
Heart HealthBlood Pressure SupportHealthy CirculationMemory SupportBrain HealthBlood Sugar BalanceMetabolic HealthMood Balance
Editorial transparency
- Written by
- AlternativeMed editorial team. Research compiled with AI assistance, then checked against PubMed records and regulator documents.
- Medical review
- None. This page has not been reviewed by a physician or pharmacist.
- First published
- 2026-10-30
- Last substantive update
- 2026-10-30
- How we research
- We re-read PubMed abstracts (and full text where noted) for the main studies, read the US FDA caffeine page and the US cacao product rules, and checked the plant name against GBIF.
- 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.
Sources 17
Each source was opened and checked. Where we read only the abstract, it says so. The small numbers in the text point here.
- Abt E, Robin LP. Perspective on Cadmium and Lead in Cocoa and Chocolate. J Agric Food Chem. 2020. PMID 32293881. DOI 10.1021/acs.jafc.9b08295. (abstract)
- Avasarala J. Dark chocolate, heavy metals, and neurodevelopment in children. Food Chem Toxicol. 2026. PMID 41101683. DOI 10.1016/j.fct.2025.115799. (abstract)
- Baker LD, Manson JE, Rapp SR, Sesso HD, Gaussoin SA, Shumaker SA, Espeland MA. Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial (COSMOS-Mind). Alzheimers Dement. 2023. PMID 36102337. DOI 10.1002/alz.12767. (abstract)
- GBIF. GBIF Backbone Taxonomy: Theobroma cacao L. (usageKey 3152205). gbif.org. 2026. (database record)
- Goya L, Kongor JE, de Pascual-Teresa S. From Cocoa to Chocolate: Effect of Processing on Flavanols and Methylxanthines and Their Mechanisms of Action. Int J Mol Sci. 2022. PMID 36430843. (abstract (Europe PMC))
- Hands JM, Anderson ML, Cooperman T, Balsky JE, Frame LA. A multi-year heavy metal analysis of 72 dark chocolate and cocoa products in the USA. Front Nutr. 2024. PMID 39144282. DOI 10.3389/fnut.2024.1366231. (abstract)
- Kovalkovicova N, Sutiakova I, Pistl J, Sutiak V. Some food toxic for pets. Interdiscip Toxicol. 2009. PMID 21217849. DOI 10.2478/v10102-009-0012-4. (abstract + full text (Europe PMC, PMC2984110))
- Nutritional Outlook. EU Health Claim for Cocoa Flavanols and Blood Flow (trade-press report of EFSA Journal 2012;10(7):2809). nutritionaloutlook.com. 2012. (trade-press page (summary-only for EFSA))
- Ried K, Fakler P, Stocks NP. Effect of cocoa on blood pressure. Cochrane Database Syst Rev. 2017. PMID 28439881. DOI 10.1002/14651858.CD008893.pub3. (abstract)
- Sakuda M, Ito K, Adaniya Y, Watanabe N, Han L, Natsume M, Nakamura K. Impact of cocoa flavanols on blood pressure and vascular function: an updated systematic review and meta-analysis of randomized controlled trials. J Nutr Health Aging. 2026. PMID 42679502. DOI 10.1016/j.jnha.2026.100966. (abstract)
- Sesso HD, Manson JE, Aragaki AK, et al.. Effect of cocoa flavanol supplementation for the prevention of cardiovascular disease events: the COcoa Supplement and Multivitamin Outcomes Study (COSMOS) randomized clinical trial. Am J Clin Nutr. 2022. PMID 35294962. DOI 10.1093/ajcn/nqac055. (abstract + full text (Europe PMC, PMC9170467))
- Simpson EJ, Mendis B, Dunlop M, Schroeter H, Kwik-Uribe C, Macdonald IA. Cocoa Flavanol Supplementation and the Effect on Insulin Resistance in Females Who Are Overweight or Obese: A Randomized, Placebo-Controlled Trial. Nutrients. 2023. PMID 36771271. DOI 10.3390/nu15030565. (abstract)
- Sun Y, Zimmermann D, De Castro CA, Actis-Goretta L. Dose-response relationship between cocoa flavanols and human endothelial function: a systematic review and meta-analysis of randomized trials. Food Funct. 2019. PMID 31524216. DOI 10.1039/c9fo01747j. (abstract)
- Thornton SA, Mincin TM, Adebambo OA, Unice KM, Kreider ML. Analytical measurement and human health risk assessment of selected metals from commercial chocolate bars. Food Chem Toxicol. 2026. PMID 41692062. DOI 10.1016/j.fct.2026.116011. (abstract)
- Thornton SA, Mincin TM, Adebambo OA, Kreider ML, Unice KM. Probabilistic biokinetic lead modeling to quantify relative contribution of chocolate bar intake to blood lead levels. Food Chem Toxicol. 2026. PMID 41592635. DOI 10.1016/j.fct.2026.115979. (abstract)
- US Food and Drug Administration / eCFR. 21 CFR Part 163 Subpart B, Cacao Products (eCFR). ecfr.gov. 2026. (full text (eCFR API))
- US Food and Drug Administration. Spilling the Beans: How Much Caffeine Is Too Much?. fda.gov consumer update. 2024. (full-text page)
