Cocoa

Completeness scorecard

Deterministic gap audit — no score is composite, no cell is LLM-judged. Each chip is re-derivable by re-running tools/evidence/build-ingredient-scorecard.mjs. review: residuals and missing data are worked autonomously via data/evidence/ingredient-scorecard-review-flags.csv and wiki/completeness-gaps.md.

Cocoa is identified by JECFA 91st 2022 as the specific commodity responsible for a 2019-data-driven upward revision of dietary cadmium exposure estimates for children aged 0.5 to 12, with cocoa-inclusive total dietary exposure reaching 96 percent of the JECFA provisional tolerable monthly intake in that age group. The cocoa-specific Codex Code of Practice (CXC 81-2022) is the load-bearing primary source for the cocoa-cadmium mitigation pathway and is referenced from the Mitigation options section below.

Heavy metal contamination profile

Per-analyte snapshot derived from the machine-readable contamination_profile in the frontmatter above. data gap indicates the literature has been reviewed for this commodity-analyte combination and no usable occurrence data was found (a finding, not a placeholder). The Key sources column shows the top 2-3 contributing sources by year and sample size, with numbered wikilink aliases.

Why this commodity accumulates cadmium

Cocoa trees (Theobroma cacao) take up cadmium from soil through their root system. Soil cadmium concentrations in several major cocoa-producing regions, particularly parts of Latin America (Ecuador, Peru, Colombia, the Dominican Republic), are elevated either by natural geology (volcanic soils, cadmium-rich parent materials) or by historical agricultural amendments. Regional variation in finished-cocoa cadmium concentrations is substantial, and the 2019 occurrence data submitted to JECFA showed higher mean cadmium concentrations in cocoa products than had been recognized in the earlier 2013 JECFA assessment, driven in part by broader geographical sampling.

Ranges by source, region, and variety

The defining feature of cocoa cadmium is order-of-magnitude geographic variation driven by underlying soil-Cd distribution. West African origins (Ghana, Côte d’Ivoire, Nigeria) cluster at the lower end: typical cocoa-solids Cd in the 100-300 ppb range, documented across multiple market surveys including Abt et al. 2018 of US-market chocolate. Latin American and Caribbean (LAC) origins cluster at the higher end: typical cocoa-solids Cd in the 600-1,500 ppb range, with sub-regional variation driven by altitude, soil pH, and the underlying volcanic and sedimentary substrate. The Meter 2019 LAC review and the Thomas 2023 Peru-specific multi-region dataset (n=2,194 samples across 563 farms in 13 Peruvian departments) establish the within-region segmentation at farm scale: Tumbes, Piura, Amazonas, and Loreto are the primary high-Cd zones in Peru, with high-altitude Ecuadorian and Colombian regions also implicated.

Within a sourcing region, varietal and rootstock differences contribute another fold of variation. The ClimaLOCA project documents multi-country germplasm screening that identified low-Cd accessions in Colombia, Ecuador, and Peru, demonstrating that varietal selection can shift bean Cd content by 30-50 percent within a single sourcing region.

Lead in cocoa shows a different geographic pattern. Bean Pb is dominated by post-harvest contamination (drying-yard contact with soil, processing-equipment metal contact, storage and shipping contamination) rather than by soil Pb concentration. The US chocolate Pb temporal decline across 2014-2022 reflects industry-wide tightening of post-harvest handling under California Prop 65 enforcement pressure, not a change in source-region selection. The Cd-Pb decoupling means brand QA mitigation strategy differs: Cd is sourcing-driven, Pb is process-driven.

The JECFA 91st meeting monograph aggregates cocoa cadmium across the 17 GEMS/Food cluster diets and establishes the basis for the 2022 upward revision of children’s dietary Cd exposure estimates. The cluster-level aggregation in JECFA is appropriate for the international exposure-assessment use case but is coarser than what brand QA needs; per-region and per-farm data come from the underlying primary literature cited above.

Processing effects

Cocoa processing concentrates or redistributes cadmium between the defatted solids and the cocoa butter fraction. The key transformations:

Fermentation (post-harvest, pre-drying) affects cadmium content modestly. Mucilage-draining interventions specified in CXC 81-2022 section 4.3 (12, 24, or 36 hour draining before fermentation) reduce bean Cd without affecting organoleptic quality. Saccharomyces cerevisiae inoculation during fermentation has been shown experimentally to absorb cadmium and reduce bean Cd content.

Drying does not change bean Cd content meaningfully but introduces Pb exposure risk where beans contact soil. Drying on solid surfaces and to under 8 percent moisture is the operational specification per CXC 81-2022.

Roasting, winnowing, and grinding do not change Cd content but redistribute weight. Roasted nibs (post-shell removal) carry the same Cd concentration as the unfermented bean kernel approximately; winnowing removes the cocoa-shell fraction which can carry trace Pb from external contamination.

Cocoa butter extraction is the dominant concentration-effect step. Pressing the roasted cocoa liquor separates approximately half the mass as cocoa butter and half as defatted cocoa cake (later ground to cocoa powder). Cadmium concentrates into the cake/powder fraction; cocoa butter is approximately an order of magnitude lower in Cd than the source bean. Cocoa powder therefore carries the highest Cd of any common cocoa derivative.

Alkalization (Dutching) does not change Cd content but raises pH of finished cocoa powder for color and dispersibility. Alkalized cocoa powder carries the same Cd as the source nib it was made from.

Conching and tempering (chocolate manufacture) do not change Cd content. Finished-chocolate Cd is determined by the cocoa-percentage formulation: dark chocolate at 70+ percent cocoa solids carries more Cd than milk chocolate at 30 percent cocoa solids at equal serving size, with the difference tracking linearly with cocoa-solids fraction.

Ingredient-derivative risk

Derivative products of cocoa redistribute cadmium between cocoa solids and cocoa butter during processing. Cocoa powder carries the highest cadmium concentration of common cocoa derivatives because the manufacturing process concentrates the cadmium in the defatted solids; cocoa butter, by contrast, carries relatively little. Dark chocolate (high cocoa solids) therefore carries more cadmium than milk chocolate at equal serving size. The JECFA 91st meeting finding that cocoa powder alone drives a 97.5th-percentile cadmium exposure of 12 µg/kg body weight per month in European children aged 7 to 11 reflects this concentration effect.

Mitigation options

Cocoa cadmium mitigation is structured across all four mitigation classes and is the second-highest-salience commodity in the wiki’s mitigation coverage after rice arsenic. The Codex CXC 81-2022 Code of Practice for the Prevention and Reduction of Cadmium Contamination in Cocoa Beans is the foundational regulatory document spanning the agronomic, processing, and formulation strategy classes and is the load-bearing primary source for the cocoa-cadmium content on this page.

The levers below are ordered by impact magnitude on bean-level cadmium concentration. Sourcing geography is the single largest lever because the underlying soil-Cd distribution varies by an order of magnitude across producing regions; agronomic interventions move the needle within a sourcing region but rarely overcome the geographic baseline. Pb mitigation follows a different lever order because Pb is primarily processing-side per the US-chocolate-Pb synthesis; sourcing-region change moves Pb less than manufacturer-side process control does.

Sourcing levers (highest Cd impact)

Origin-region selection is the dominant brand-side cadmium intervention in EU markets given the 915 cocoa cadmium maximum levels. West-African origins (Ghana, Côte d’Ivoire, Nigeria) are documented at order-of-magnitude lower cadmium than parts of Latin America: African-origin product means cluster in the 100-300 ppb range while LAC-origin means cluster in the 600-1,500 ppb range per Abt 2018 and the Meter 2019 LAC review. Within Latin America, Thomas 2023 documents that altitude and soil-pH segmentation differentiates lower- and higher-cadmium Peruvian production zones at the farm scale (n=2,194 samples across 563 farms in 13 Peruvian departments); Tumbes, Piura, Amazonas, and Loreto are the primary high-Cd zones. Origin-segmented sourcing combined with batch-level Cd testing at intake is the most effective single brand-side lever for cocoa cadmium reduction; conservative magnitude is a 2-to-5-fold cocoa-solids Cd reduction by replacing typical LAC sourcing with West-African sourcing or low-Cd LAC sub-regions.

Agronomic levers (moderate Cd impact within a sourcing region)

Agronomic mitigation for cocoa is dominated by soil pH management (liming at 3 t/ha/year preferably as dolomite to raise pH above 6 immobilizes cadmium in acidic Latin American volcanic substrate per CXC 81-2022 section 4.2.2), cultivar and rootstock selection (low-Cd-bioaccumulation genotypes used in breeding and as grafting rootstocks per CXC 81-2022; the ClimaLOCA project documents multi-country germplasm screening identifying low-Cd accessions in Colombia, Ecuador, and Peru), zinc supplementation under deficient soils (cadmium and zinc compete for plant uptake; zinc sulphate fertilization), biochar amendment (Cd-uptake reduction comparable to and additive with liming per Vega-Jara 2025), and avoidance of high-cadmium phosphate fertilizers and apatite/rock phosphate where Cd content is uncertain. Quantified magnitude varies by intervention and site; CXC 81-2022 reports liming as the single most-effective agronomic lever with documented Cd-uptake reductions in the 30-60 percent range across multiple cited studies.

Processing levers (moderate Cd impact; primary Pb lever)

Processing mitigation for cocoa Cd is dominated by post-harvest fermentation interventions specified in CXC 81-2022 section 4.3: mucilage draining for 12, 24, or 36 hours reduces cadmium concentrations without affecting organoleptic quality, and Saccharomyces cerevisiae inoculation during fermentation absorbs cadmium and reduces bean Cd content per experimental studies cited in the CoP. For Pb, drying surface cleanliness (drying on solid surfaces to less than 8 percent moisture, avoiding soil contamination), storage protection from fuel and exhaust contamination, and manufacturing-equipment metal-contact specifications are the primary processing levers and the load-bearing reason the US chocolate Pb declined 2014-2022 under Prop 65 enforcement pressure.

Formulation levers (moderate Cd impact via dilution)

Formulation mitigation for cocoa-containing products includes cocoa-percentage adjustment (lower-cocoa-solids products have correspondingly less cocoa-derived cadmium following a roughly linear dilution; 50 percent cocoa solids has roughly half the Cd of 100 percent cocoa solids), cocoa-origin sourcing realized at the recipe level (a high-cocoa formulation can still hit Cd targets if origin is selected appropriately), and substitution of cocoa butter for cocoa powder where formulation permits (cocoa butter is approximately one order of magnitude lower in cadmium than the defatted solids because Cd concentrates in the protein-and-fiber fraction during cocoa butter extraction).

Testing and QC levers (detection and exclusion)

Lot-level ICP-MS at intake (in addition to or instead of spot-check post-receipt) gives detection power for Cd at parts-per-billion sensitivity that distinguishes compliant from non-compliant lots before manufacturing commits the lot to product. Third-party testing rather than supplier-attestation is the brand-legal-defensibility lever; supplier attestation gives the certifying brand no independent provenance to defend in litigation. The Ramtahal 2016 finding that pod and leaf Cd correlate with bean Cd enables pre-harvest agronomic screening for Cd compliance, which moves the lever upstream into the supplier rather than at intake.

Packaging and storage levers

Not applicable to cocoa Cd or Pb at meaningful magnitude. Cocoa is not canned in tin (Sn not a relevant contamination route), and aluminum-foil contact does not move bean-level metal load. Storage protection from fuel/exhaust contamination per CXC 81-2022 is captured under processing levers above.

Abt 2018 sample-level occurrence values

Abt et al. 2018 is the primary FDA U.S.-market occurrence dataset for Cd and Pb in cocoa products. Key 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 cites these values within the broader JECFA-and-Codex regulatory context.

Cd range across all 144 cocoa-and-chocolate samples abt2018-cadmium-lead-cocoa-chocolate-us-market: 0.004 to 3.15 mg/kg. Pb range: <LOD to 0.38 mg/kg. The 26 cocoa-powder samples with 100 percent cocoa content had a mean Cd of 0.99 ± 0.87 mg/kg. Cd was significantly higher in Latin American product than in African product. 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 cocoa

Cocoa carries measurable but lower Pb than Cd, with the strongest signal in cocoa powder rather than finished chocolate. Abt et al. 2018 reports mean Pb in cocoa powder at 0.11 ± 0.10 mg/kg (range below LOD to 0.38 mg/kg across 144 samples), with cocoa nibs at 0.003 ± 0.004 mg/kg, dark chocolate at 0.03 ± 0.02 mg/kg, and milk chocolate at 0.01 ± 0.01 mg/kg. Pb correlated significantly with percent cocoa solids and showed geographic variation (Latin America somewhat higher than Africa) but with a smaller spread than Cd. The 2020 FDA perspective (Abt and Robin 2020) frames cocoa Pb as principally anthropogenic-deposition-driven rather than geogenic, in contrast with the largely soil-Cd-driven Cd signal. The U.S. FDA Pb-in-candy guidance recommends a maximum level of 0.1 mg/kg in candy including chocolate candy.

Nickel in cocoa

Cocoa is the single highest-Ni dietary commodity in the food supply. Flyvholm et al. 1984 reports cocoa mean Ni at 9.8 µg/g (range 8.2 to 12 µg/g, n=7 samples across the post-1969 literature using AAS or PIXE), the highest mean of any food matrix in their 2,221-sample compilation. Soy beans by comparison average 5.2 µg/g and oatmeal 1.76 µg/g; cocoa sits a full order of magnitude above most dietary staples. The high Ni concentration reflects the cacao tree’s high root Ni-uptake capacity from tropical soils combined with processing-equipment contact during cocoa-mass and cocoa-powder manufacture. EFSA Nickel 2020 subsequently confirmed cocoa among the principal dietary Ni sources alongside drinking water, nuts, legumes, and cereals, and calibrated its chronic TDI of 13 µg Ni/kg b.w./day against this matrix mix. Ni in cocoa is also clinically relevant for nickel-sensitized individuals (systemic contact dermatitis flare-ups, SNAS); the EFSA 2020 acute LOAEL of 4.3 µg Ni/kg b.w. for eczematous flare-up reactions identifies cocoa-frequent consumers as one of the at-risk dietary subgroups, and Pacor et al. 2003 independently confirmed cocoa as the food most consistently aggravating oral nickel-related symptoms (92.6 percent of patients identified cocoa as an aggravating food). Sample-level cocoa Ni concentration distributions from modern speciation studies are still sparse; cocoa Ni surveillance is a continuing priority.

Aluminum in cocoa

Cocoa is a recognized Al matrix from a combination of plant uptake (cacao tree roots take up Al from acidic tropical soils) and processing-equipment contact (alkalization step in cocoa manufacturing uses alkaline reagents in aluminum-containing vessels in some plants). Elsheikh et al. 2020 reports Al in cocoa sweets among the children’s-food matrices analyzed in Turabah province, Saudi Arabia (B-tier evidence; Saudi-market specific). Direct sample-level cocoa Al concentration distributions from U.S. or EU markets are not yet loaded on the wiki. The metal warrants a Phase 3b raw/markdown sweep for primary cocoa Al occurrence work.

Chromium in cocoa

Hernandez et al. 2019 reports that cocoa-containing products consistently show the highest Cr concentrations across the French food categories surveyed: four breakfast cereals containing chocolate ranged 360 to 483 ppb total Cr; a dry chocolate biscuit averaged 103 ppb. The authors note the cocoa-Cr association is “consistent with prior EFSA findings.” This is total Cr rather than Cr-VI specifically; the Hernandez paper measures both species, and Cr-VI in cocoa-containing finished products remains a candidate for additional surveillance ingest. The total-Cr signal supports flagging cocoa as a Cr-bearing matrix worth monitoring; whether finished-product Cr-VI fractions are significant requires speciation studies that are not yet loaded.

Other metals of concern

The remaining HMI-tracked metals on cocoa (iAs, tAs, tHg, MeHg, Sn, U) do not have strong cocoa-specific occurrence evidence in the loaded corpus. Cocoa is not a primary arsenic matrix (rice and seafood dominate the dietary As pathway), is not canned in tin (so Sn is not a cocoa-specific exposure route), and does not carry meaningful Hg or U at population level. These metals remain at status: pending on the contamination_profile.

Regulatory limits that apply

• jecfa-cadmium-ptmi — Not a cocoa-specific limit but the health-based reference value Codex cocoa MLs are aligned against; children 0.5 to 12 can reach 96 percent of the PTMI with cocoa included in total dietary intake (JECFA 91st 2022).
• codex-cadmium-mls / Codex CXS 193-1995 — International matrix-specific Cd maximum levels: cocoa powder (100 percent cocoa solids on dry matter basis) 2.0 mg/kg; chocolate ≥70 percent cocoa solids 0.9 mg/kg; chocolate 50 to less than 70 percent cocoa solids 0.8 mg/kg; chocolate 30 to less than 50 percent cocoa solids 0.7 mg/kg; chocolate less than 30 percent cocoa solids (including milk chocolate) 0.3 mg/kg.
• eu-2023-915-cadmium — EU Cd maximum level for cocoa powder placed on the market for the final consumer or as an ingredient in sweetened cocoa powder/powdered chocolate is 0.60 mg/kg (600 ug/kg). Chocolate products are regulated separately by cocoa-solid percentage on chocolate.
• 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. No cocoa-specific Ni ML at international level.
• FDA Pb in candy: recommended maximum level 0.1 mg/kg for candy including chocolate candy (Abt and Robin 2020 cites the FDA guidance).

Sources

Auto-generated from source-page frontmatter. The “Used on this page for” column is populated by the orchestrator’s POPULATE-SOURCE-LEGEND action; pending entries appear as *[awaiting synthesis]*.

Page history

The five most recent substantive edits to this page. The full version history lives in git; when DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.