Cabbage

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.

Cabbage (Brassica oleracea var. capitata) is the head-forming leafy vegetable consumed fresh as slaw, fermented as sauerkraut and kimchi, and cooked in countless preparations. As a brassica, cabbage sits at the middle of the vegetable-category heavy-metals risk distribution: lower than open-leaf greens (spinach, kale) because the compact head structure reduces surface-area-to-volume ratio and atmospheric Pb deposition, but a moderate Cd accumulator because brassicas as a family tend to take up cadmium efficiently from soil. The current corpus loads 4 sources directly routed to cabbage plus broader vegetable surveys reachable via the routing layer: Armand 2026 Behbahan Iran probabilistic lettuce-and-cabbage risk assessment (n=40, armand2026-lettuce-cabbage-behbahan), Islam 2007 dietary toxicity in vegetables and food crops covering cabbage cross-context (islam2007-dietary-toxicity-vegetables-food-crops), Okonofua 2024 Nigerian mining-pits cabbage-fish-water bioaccumulation work (n=48, okonofua2024-mining-pits-cabbage-fish-nigeria), Reczajska 2005 Polish 272-sample chromium in plant foods including cabbage (reczajska2005-chromium-plant-foods-poland), See 2025 Malaysian leafy-vegetable ICP-OES panel (n=12, see2025-malaysia-leafy-vegetables-icp-oes).

Why this commodity accumulates heavy metals

Cabbage takes metals from soil predominantly through root uptake, with brassicas (Brassica oleracea, B. rapa, B. juncea, B. napus) known as moderate-to-high cadmium accumulators relative to other vegetable families. The compact head structure reduces surface-area-to-volume ratio relative to open-leaf greens, which means atmospheric Pb deposition is a smaller contributor than for spinach or kale grown in the same soil. The outer-leaf-vs-inner-head distinction matters: outer leaves are exposed to atmospheric deposition and carry slightly more Pb, while inner head tissue reflects primarily root-uptake. The Armand 2026 Iranian Behbahan probabilistic risk modeling work covered both lettuce and cabbage and found Pb, Cd, Cr, Ni at cumulative-exposure levels of concern under reasonable-worst-case consumption assumptions (armand2026-lettuce-cabbage-behbahan). The Okonofua 2024 Nigerian mining-pits work demonstrated bioaccumulation of Pb, Cd, tHg, Ni from contaminated mining-area water into cabbage tissue and the associated tilapia fish, with concentrations in both reaching levels of regulatory concern (okonofua2024-mining-pits-cabbage-fish-nigeria). The Reczajska 2005 Polish 272-sample chromium-in-plant-foods work provides the strongest single dataset for Cr-in-cabbage specifically (reczajska2005-chromium-plant-foods-poland).

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.

Ranges by source, region, and variety

The corpus covers cabbage from Iran (Behbahan, n=40 across lettuce-and-cabbage), Nigeria (Okonofua mining-pits, n=48 across water-vegetable-fish), Poland (Reczajska Cr panel, n=272 plant foods including cabbage), Malaysia (See 12-sample multi-leafy panel), and the Islam 2007 cross-jurisdiction (CN, UK, US) dietary-toxicity work. Variety-level pattern: green cabbage, red cabbage, savoy cabbage, and napa cabbage have similar metal profiles within commodity-grade product. The Brassica genus relationship means cabbage shares cadmium-accumulation patterns with broccoli, cauliflower, Brussels sprouts, kale, kohlrabi, and bok choy; the loaded corpus does not provide a clean cabbage-vs-other-brassica comparison, but the general pattern is consistent. Origin: temperate European and North American commodity cabbage carries lower baseline Cd than brassica grown on tropical soils with elevated background Cd or on mining-influenced soils.

Processing effects

Removing outer leaves before consumption reduces per-serving Pb modestly (the outer leaves are the primary atmospheric-deposition target). Washing whole heads removes surface particulate but does not affect internalised metals. Cooking by boiling leaches Cd and Cr into the cooking water; discarding the cooking water reduces per-serving exposure. Sauerkraut and kimchi (fermented cabbage products) carry the parent cabbage’s metal load with negligible processing-driven change; fermentation does not concentrate or dilute metals on a per-mass basis. Drying for dehydrated-cabbage applications (used in instant soups and ration packs) concentrates metals on a dry-weight basis by 8-10×. Pickling in vinegar inherits the cabbage’s metal load plus any vinegar-derived contributions; see vinegar for the vinegar baseline.

Ingredient-derivative risk

Fresh whole-head cabbage represents the baseline. Pre-cut bagged coleslaw and shredded cabbage carry the same per-mass load. Sauerkraut and kimchi inherit the parent cabbage’s metal load. Cabbage soup and prepared-soup products carry the cabbage’s load at the inclusion ratio plus any other-ingredient contributions. Cabbage juice (cold-pressed) extracts soluble metals; per-serving exposure tracks fresh-weight concentration at the juice-yield ratio. Dehydrated cabbage powder (rare, used in some supplement and instant-soup applications) concentrates metals on a dry-weight basis.

Mitigation options

Sourcing levers

Source from production regions and operations with documented soil-and-water screening, away from mining corridors and industrial-corridor settings. The Okonofua 2024 Nigerian mining-pits work documents the magnitude of mining-source contamination directly (okonofua2024-mining-pits-cabbage-fish-nigeria).

Agronomic levers

Soil pH management around 6.5 reduces Cd bioavailability. Avoid phosphate fertilisers with elevated Cd impurity. The Brassica cadmium-uptake pathway is well-documented; agronomic interventions reduce the upstream load. Irrigation source: switch from contaminated industrial-corridor groundwater to municipal-treated or rain-harvested water.

Processing levers

Remove outer leaves before sale or processing. Boil-and-discard-water reduces Cd-and-Cr modestly. Fermentation does not change the metal load. Drying concentrates metals on a dry-weight basis.

Formulation levers

For finished products using cabbage as an ingredient, the inclusion ratio caps per-serving exposure. Substitution between brassica varieties does not meaningfully change the Pb-Cd profile.

Testing and QC levers

Lot-level ICP-MS testing for Pb, Cd, Cr, and Ni at detection floors ≤ 10 ppb is appropriate for commodity cabbage buyers. For dehydrated or powder applications, dry-weight testing with fresh-weight-equivalent conversion is standard.

Packaging and storage levers

Standard food-grade packaging does not contribute to the cabbage metal load. For fermented cabbage products (sauerkraut, kimchi), the fermentation vessel material matters; glass or food-grade plastic do not contribute metals, ceramic-glaze vessels with unverified coatings can extract Pb.

Regulatory limits that apply

The Codex Alimentarius General Standard CXS 193-1995 applies the brassica-vegetables Pb maximum of 0.30 mg/kg fresh weight (or the general leafy-vegetable limit where cabbage is classified as leafy) and Cd at 0.10 mg/kg fresh weight (general vegetables). The EU Regulation 2023/915 applies Pb 0.10 mg/kg for “brassica vegetables, leafy vegetables and fresh herbs” and Cd 0.050 mg/kg for the same category — substantially tighter than Codex. The FDA does not set a cabbage-specific action level. The Armand 2026 Behbahan probabilistic risk modeling found cumulative-intake metrics for Iranian lettuce-and-cabbage above thresholds of concern under reasonable-worst-case consumption assumptions, consistent with the broader leafy-vegetable category (armand2026-lettuce-cabbage-behbahan).

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.