Heavy metals in Chocolate

This page draws on evidence from EFSA and Codex Alimentarius, together with 10 peer-reviewed studies. The complete citation list is at the bottom of the page.

Overview

Chocolate is a processed derivative of Cocoa and inherits cadmium from its cocoa-solid fraction; cadmium content scales approximately with cocoa-solid percentage and with cocoa origin.

Heavy metal contamination profile

This table summarizes the available occurrence evidence for each metal. A data gap means the literature was reviewed for this commodity and metal but no usable occurrence data was found. Key sources link to contributing studies.

Why this commodity accumulates cadmium

Chocolate carries cadmium primarily through its cocoa solids, which concentrate cadmium from the cocoa beans during processing (see Cocoa for the upstream story). Cocoa butter, the other principal cocoa-derived ingredient in chocolate, carries relatively little cadmium. As a consequence, dark chocolate (higher cocoa-solid percentage) carries more cadmium per serving than milk chocolate (lower cocoa-solid percentage, higher milk and sugar fractions), and baking or confectionery chocolate made from cocoa powder can be particularly cadmium-heavy. White chocolate, which contains cocoa butter but not cocoa solids, carries minimal cadmium from the cocoa pathway.

Ranges by source, region, and variety

EFSA 2009 Table 1 of approximately 140,000 European samples reported a mean cadmium concentration in chocolate of 0.090 mg/kg, which is one-half the mean reported for cocoa (0.178 mg/kg), consistent with the dilution from milk, sugar, and cocoa butter in typical chocolate formulations. Dark-chocolate-specific values are higher; brand and origin variation is substantial and is the subject of Consumer Reports and HBBF published testing that is outside this wiki’s brand-level firewall scope._

A survey measured 72 US dark chocolate and cocoa products as sold and reported lead at a mean of 0.062 mcg/g (62 µg/kg) and a median of 0.05 mcg/g (50 µg/kg), with a range of 0.009 to 0.269 mcg/g, and cadmium at a mean of 0.396 mcg/g (396 µg/kg) and a median of 0.239 mcg/g (239 µg/kg), with a range of 0.016 to 2.2 mcg/g (11). An FDA convenience sample of 144 US retail products from 67 manufacturers reported a dark chocolate mean of 0.27 ± 0.25 mg/kg cadmium (270 ± 250 µg/kg) and 0.03 ± 0.02 mg/kg lead (30 ± 20 µg/kg), and a milk chocolate mean of 0.06 ± 0.07 mg/kg cadmium (60 ± 70 µg/kg) and 0.01 ± 0.01 mg/kg lead (10 ± 10 µg/kg), without a brand ranking (1).

Processing effects

Pending. Formulation (percent cocoa solids, presence of milk, use of cocoa powder versus chocolate liquor) is the dominant processing-level driver of finished-product cadmium. Conching and tempering do not meaningfully alter cadmium content.

Ingredient-derivative risk

A chocolate-containing ingredient list translates to cadmium exposure primarily through the cocoa-solid fraction. Apps estimating cadmium from ingredient lists should weight the chocolate contribution by approximate percent cocoa solids when that information is available on the label, and default to a representative mid-range cocoa-solid percentage (approximately 35 to 50 percent for most mass-market chocolates) when it is not.

Mitigation options

Pending. Upstream cocoa-sourcing decisions are the meaningful mitigation lever for chocolate manufacturers; see Cocoa.

Abt 2018 sample-level occurrence values

Abt et al. 2018 is the primary FDA U.S.-market occurrence dataset for finished chocolate products. Per-matrix means below; full ranges and stratification by percent cocoa and by Latin America versus Africa origin are in the source page. The 2020 perspective Abt and Robin 2020 contextualizes these values within the JECFA-and-Codex regulatory landscape and the JECFA finding that cocoa-and-chocolate consumption can drive 30-69 percent of total cadmium (Cd) intake in high-consumer children.

The four-fold higher Cd in dark chocolate versus milk chocolate reflects the higher percent cocoa content in dark chocolate; Cd and lead (Pb) were both significantly correlated with percent cocoa across the dataset. These values count as one literature evidence primary source under Persistent Wiki Ingest Rule synthesis discipline; Abt 2020 is a secondary citation that does not add new primary data.

Lead in chocolate

Chocolate inherits Pb from its cocoa-solid fraction with the four-fold dark-versus-milk gradient documented in Abt et al. 2018: dark chocolate mean 0.03 ± 0.02 mg/kg, milk chocolate mean 0.01 ± 0.01 mg/kg, across the 144-sample U.S. retail convenience-sample survey. Pb correlated significantly with percent cocoa solids, mirroring the Cd pattern. The 2020 FDA perspective (Abt and Robin 2020) frames chocolate Pb as principally anthropogenic-deposition-driven via the cocoa bean rather than added during chocolate manufacture. The U.S. FDA Pb-in-candy guidance recommends a maximum level of 0.1 mg/kg in candy including chocolate candy; finished chocolate products in the Abt 2018 dataset fall comfortably below the guidance, though high-percent-cocoa dark chocolate has been documented at or above this level in some independent third-party testing not yet in the loaded corpus.

Nickel in chocolate

Chocolate carries nickel (Ni) proportional to its cocoa-solid fraction. Flyvholm et al. 1984 reports bitter (dark) chocolate at 1.9 µg/g (range 1.3 to 2.7 µg/g, n=7) and milk chocolate at 0.7 µg/g (range 0.4 to 1.2 µg/g, n=11) from the post-1969 AAS/PIXE literature. The roughly 3x gap between bitter and milk chocolate maps cleanly onto the cocoa-solid percentage difference, which is consistent with the >9 µg/g concentration in cocoa itself (Flyvholm 1984). EFSA Nickel 2020 subsequently confirmed cocoa among the principal dietary Ni sources and dark chocolate inherits that load. Nickel-sensitized individuals (systemic contact dermatitis-prone, approximately 10 to 15 percent of the European adult population per EFSA) can experience flare-ups from high-cocoa dark chocolate consumption; the EFSA acute LOAEL of 4.3 µg Ni/kg b.w. for eczematous flare-up identifies chocolate-heavy consumers as one of the dietary subgroups at risk. Pacor et al. 2003 documents cocoa-and-chocolate as the most consistently symptom-aggravating food category in nickel-reactive recurrent aphthous stomatitis (92.6 percent of patients).

Aluminum in chocolate

Chocolate carries aluminum (Al) from a combination of cocoa-solid uptake (cacao tree root Al accumulation from tropical soils) and any processing-equipment or alkalization-step contribution. Elsheikh et al. 2020 reports Al in cocoa sweets in Saudi Arabia (B-tier journal; matrix-specific Al concentrations in cocoa sweets), and biscuit brand 6 in that survey reached a remarkable 291,900 ppb total Al (outlier value that the source page flags for follow-up). Direct U.S. or EU-market chocolate Al concentration distributions are not yet loaded on the wiki. Phase 3b ingest of primary cocoa-and-chocolate Al occurrence work would firm this cell.

Chromium in chocolate

Hernandez et al. 2019 documents that cocoa-containing finished products consistently show the highest chromium (Cr) concentrations among the French food categories surveyed: chocolate-containing breakfast cereals 360 to 483 ppb total Cr; a dry chocolate biscuit averaged 103 ppb. The paper measures both total Cr and hexavalent chromium (Cr-VI) by speciation; whether the Cr-VI fraction in finished chocolate products is significant requires the underlying Hernandez 2019 speciation tables and additional cross-source confirmation. The total-Cr signal supports flagging chocolate as a Cr-bearing finished-product category; Cr-VI-specific speciation data for chocolate matrices is a documented data gap.

Other metals of concern

The remaining HMI-tracked metals on chocolate (iAs, total arsenic (tAs), total mercury (tHg), methylmercury (MeHg), tin (Sn), U) do not have strong chocolate-specific occurrence evidence in the loaded corpus. Chocolate is not a primary arsenic matrix, is not canned in tin, and does not carry meaningful mercury (Hg) or uranium (U) at population level. These metals remain at status: pending on the contamination_profile.

Regulatory limits that apply

• JECFA — Provisional Tolerable Monthly Intake for Cadmium, 25 µg/kg b.w./month — JECFA 91st meeting 2022: cocoa powder alone drives a 97.5th-percentile cadmium exposure of 12 µg/kg b.w./month in European children aged 7 to 11, indicating that chocolate products heavy in cocoa powder warrant particular attention for child consumers.
• Codex Alimentarius — Maximum Levels for Cadmium in Food / Codex CXS 193-1995 — International Cd MLs scaled by cocoa-solid percentage: chocolate less than 30 percent cocoa solids (including milk chocolate) 0.3 mg/kg; 30 to less than 50 percent 0.7 mg/kg; 50 to less than 70 percent 0.8 mg/kg; 70 percent or greater 0.9 mg/kg; cocoa powder (100 percent cocoa solids dry-matter basis) 2.0 mg/kg.
• Commission Regulation (EU) 2023/915 cadmium maximum levels — EU Cd maximum levels for chocolate products: 0.10 mg/kg (100 ug/kg) for milk chocolate with less than 30 percent total dry cocoa solids; 0.30 mg/kg (300 ug/kg) for chocolate with less than 50 percent total dry cocoa solids and milk chocolate with at least 30 percent total dry cocoa solids; 0.80 mg/kg (800 ug/kg) for chocolate with at least 50 percent total dry cocoa solids.
• FDA Pb in candy: recommended maximum level 0.1 mg/kg for candy including chocolate candy (Abt and Robin 2020).
• EFSA Nickel 2020 — Chronic TDI 13 µg Ni/kg b.w./day; acute LOAEL 4.3 µg Ni/kg b.w. for eczematous flare-up in sensitized individuals.
• Commission Regulation (EU) 2024/1987 — maximum levels of nickel in certain foodstuffs — EU binding nickel maximum levels for chocolate (Reg (EU) 2024/1987, from 1 July 2025): milk chocolate with < 30 % total dry cocoa solids 2.5 mg/kg; milk chocolate with ≥ 30 % solids and other chocolate 7.0 mg/kg (Annex I points 3.6.12.1–3.6.12.2). Codex has not set an international chocolate nickel ML.

FDA TDS FY2018–FY2020 source observations

FDA measured the prepared foods named below. Each row describes that food and preparation, not every form of this ingredient. Values are µg/kg (ppb) on the FDA sample basis. ND means not detected; it is not a measured zero. Reporting limits can vary between composites. FY2018-FY2020 TDS Elements Analytical Results

References

Works cited in this page’s text, in first-appearance order. See Sources for this page’s source inventory. Each title links to a source record with bibliographic details, reported findings, and document provenance.

1. Update of the Risk Assessment of Nickel in Food and Drinking WaterEFSA Panel on Contaminants in the Food Chain (CONTAM) · EFSA Journal 2020;18(11):6268 · 2020 · doi.org/10.2903/j.efsa.2020.6268Government
2. General Standard for Contaminants and Toxins in Food and Feed (CXS 193-1995)Codex Alimentarius Commission · Codex Alimentarius (Joint FAO/WHO Food Standards Programme) · 1995 · www.fao.orgGovernment
3. A multi-year heavy metal analysis of 72 dark chocolate and cocoa products in the USAHands JM, Anderson ML, Cooperman T, Balsky JE, and Frame LA · Frontiers in Nutrition · 2024 · doi.org/10.3389/fnut.2024.1366231Peer-reviewed
4. Cadmium and Lead in Cocoa Powder and Chocolate Products in the U.S. MarketEileen Abt, Jennifer Fong Sam, Patrick Gray, and Lauren Posnick Robin · Food Additives & Contaminants: Part B Surveillance · 2018 · doi.org/10.1080/19393210.2017.1420700Peer-reviewed
5. Perspective on Cadmium and Lead in Cocoa and ChocolateEileen Abt and Lauren Posnick Robin · Journal of Agricultural and Food Chemistry · 2020 · doi.org/10.1021/acs.jafc.9b08295Peer-reviewed
6. Nickel Content of Food and Estimation of Dietary IntakeMari-Ann Flyvholm, Gitte Dalsgaard Nielsen, and Allan Andersen · Zeitschrift für Lebensmittel-Untersuchung und -Forschung 179(6):427-431 · 1984 · doi.org/10.1007/BF01043419Peer-reviewed
7. Results of Double-Blind Placebo-Controlled Challenge with Nickel Salts in Patients Affected by Recurrent Aphthous StomatitisM. L. Pacor, G. Di Lorenzo, N. Martinelli, G. Lombardo, A. Di Gregoli, P. Mansueto, et al. · International Archives of Allergy and Immunology 131(4):296-300 · 2003 · doi.org/10.1159/000072142Peer-reviewed
8. Evaluation of Some Toxic and Essential Trace Elements in Children Foods and Infant Formulae by Using ICP-OESElsheikh MA, Ali DMH, and Alotaibi SH · Asian Journal of Chemistry 32(6):1273-1278 · 2020 · doi.org/10.14233/ajchem.2020.22499Peer-reviewed
9. Cr(VI) and Cr(III) in milk, dairy and cereal products and dietary exposure assessmentHernandez F, Bemrah N, Séby F, Noël L, and Guérin T · Food Additives & Contaminants Part B: Surveillance · 2019 · doi.org/10.1080/19393210.2019.1598506Peer-reviewed
10. FY2018-FY2020 TDS Elements Analytical ResultsU.S. Food and Drug Administration · FDA Total Diet Study · 2022 · www.fda.govDataset
11. Levels of heavy metals concentrations in chocolates from Bwari market Abuja FCT, NigeriaEmmanuel Joy Enogbe and Agbaghare Daniel Enajeme · International Journal of Adulteration9:e2ijad3057 · 2025 · doi.org/10.54905/disssi.v9i10.e2ijad3057Peer-reviewed

Sources

Source records associated with this topic. Inclusion does not establish that every finding applies to this product or ingredient. References above identify works cited in the text.

Update history

No substantive edit history is available in this build. The full commit record is available in git.

Additional geographic and remediation evidence

Emmanuel Joy Enogbe, 2025. Two anonymous chocolate products from Bwari market contained measurable nickel, iron, copper, chromium and lead. Their reported sample concentrations are preserved independently of inconsistent dispersion, intake means and safety comparisons in the paper. Provides a small local occurrence observation with anonymous products. It cannot establish market prevalence, source attribution, or a no-risk conclusion. Total Cr is not Cr(VI).