Fermented beverage bases
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.
| Dimension | Status | What’s there (auditable counts) | What’s missing |
|---|---|---|---|
| D1 Analyte coverage (tier: unset) | GAP | 0/10 HMTc analytes, total n=0 | only 0/10 analytes have evidence |
| D2 Regional coverage | below-tier | 1 jurisdictions, top CN 100% | only 1 distinct jurisdiction(s) |
| D3 Anthropogenic evidence | GAP | no upstream/attribution sources | link a supply-chain/ hub page |
| D4 Background mechanism | GAP | section present, 0 drivers, 0 upstream source(s) | drivers[] empty; no upstream source to substantiate |
| D5 Pooling depth | GAP | no priority analytes | — |
| D6 Speciation | OK | iAs, tHg, tAs declared | — |
| D7 Basis declaration | GAP | 0/10 populated cells declare a basis token | 10 populated cell(s) lack a basis token: Pb, Cd, iAs, tHg, Ni, Al, Cr, Sn, tAs, U |
| D8 Provenance integrity | GAP | 0 claims checked, 0 supported; 2 citations, 0 orphan, 2 foreign | 2 foreign citation(s) not naming fermented-beverage-bases: codex-cxs-193-1995, munilla-garcia2023-lead-kombucha-ceramics |
| D9 Mitigation | GAP | 0 cited lever(s), 6 mitigation/ link(s) | section present but no source-cited lever |
| D10 Regulatory coverage | OK | 2 rule link(s), 0 metal(s) covered | — |
| D11 Standards-readiness | NOT-READY | no priority analytes | basis: 10 populated cell(s) lack a basis token: Pb, Cd, iAs, tHg, Ni, Al, Cr, Sn, tAs, U; consumption tier unset (depth bar uncheckable) |
| Principle balance | OK | consumer-protection 0.50, contamination-reduction 0.00, brand-value 0.00, legal-defensibility 0.38, scale 0.00 | — |
This is a structural ingredient node created so product pages can link to a real wiki target. Occurrence values remain pending until a source is promoted for this ingredient.
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.
| Analyte | Coverage | Typical (ppb) | p95 (ppb) | Confidence | Key sources |
|---|---|---|---|---|---|
| Pb | data gap | — | — | — | — |
| Cd | data gap | — | — | — | — |
| iAs | data gap | — | — | — | — |
| tAs | data gap | — | — | — | — |
| tHg | data gap | — | — | — | — |
| Ni | data gap | — | — | — | — |
| Al | data gap | — | — | — | — |
| Cr | data gap | — | — | — | — |
| Sn | data gap | — | — | — | — |
| U | data gap | — | — | — | — |
Routing
This node is linked from fermented-beverages-non-tea-based, kombucha-tea-based.
Contamination Profile State
The machine-readable contamination profile is pending. Ingredient-level values belong here once parsed; finished-product values belong on the relevant product-category page.
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]*.
| # | Citation | Year | Type | Used on this page for |
|---|---|---|---|---|
| 1 | Wang et al. 2020. Contamination and health risk assessment of lead, arsenic, cadmium, and aluminum from a total diet study of Jilin Province, China, Food Science & Nutrition | 2020 | Peer-reviewed | CN Pb, tAs, Cd, Al occurrence in Jilin Province total-diet-study composites across 12 food groups and 48 product groups, with consumption inputs for 7700 residents… |
Why this commodity accumulates heavy metals
Fermented beverage bases is the aggregate ingredient label for the substrate ingredients used in kombucha, water kefir, fermented juice products, jun, and other commercial fermented non-alcoholic beverages. The substrate is typically sweet tea (for kombucha and jun), juice (for water-kefir-on-fruit-juice), sweetened water (for water kefir), or a culture-medium blend. Heavy-metal load in fermented beverage bases comes from three pathways: the source tea or juice ingredient (with tea in particular carrying Pb, Cd, Al, and Mn at notable levels per the camellia-sinensis page evidence base), the source sugar (refined sugar carries low trace metals; non-refined or organic-cane sugars carry more), and the fermentation-culture inputs (SCOBY, kefir grains, or other cultures can adsorb and release metals during fermentation).
The most-studied fermented beverage base is kombucha (tea-based). The HMTc panel concerns for kombucha bases include Pb (from source tea and from container migration — the documented case of Pb poisoning from kombucha fermented in ceramic containers per the Munilla-García 2023 case established the ceramic-container Pb-migration pathway as a serious concern), Al (from source tea and aluminum-foil-lined storage), and Mn (a co-occurring metal in tea). Other fermented beverage bases sit at lower concern levels reflecting their non-tea substrates.
The data gap status across analytes in the body table reflects sparse fermented-beverage-base-specific quantitative data in the routing audit. The synthesis is grounded in the tea, camellia-sinensis, beverages, and fruit-juice corpus.
Ranges by source, region, and variety
Variance within fermented beverage bases tracks substrate composition (tea-based kombucha vs juice-based fermentation vs water-kefir on sweetened water), source-tea quality (Camellia sinensis tea from documented low-soil-Pb regions vs high-soil-Pb regions; per the camellia-sinensis page), source-juice profile (per fruit-juice for the per-juice metal baseline), fermentation-vessel material (glass vs stainless-steel vs ceramic — ceramic carries the documented Pb-migration risk), and fermentation duration (longer fermentation potentially extracts more metals from substrate and vessel).
Processing effects
Fermentation processing affects metals in two directions. First, microbial biomass (SCOBY for kombucha, kefir grains for water kefir) can adsorb metals from the substrate via cell-surface binding (a documented phenomenon in microbial-bioremediation literature), modestly reducing per-volume metal content in finished beverage relative to substrate. Second, metabolic acid production lowers pH (kombucha finished pH ≈2.5-3.5) which mobilizes metals from any metal-contact storage vessel; this is the dominant Pb-migration driver in ceramic-container kombucha. Pasteurization of finished fermented beverages does not affect metals.
Ingredient-derivative risk
Fermented beverage bases route into kombucha-tea-based (Cat 5 row covering commercial kombucha products) and fermented-beverages-non-tea-based (Cat 5 row covering water kefir, jun, fermented juice products). Derivatives include bottled kombucha (the most common commercial format), draft kombucha (kegged for restaurant-and-cafe service), shelf-stable kombucha (pasteurized for extended shelf life), and home-fermented kombucha (the highest-risk consumer-side application because of variable home-fermentation-vessel material).
Mitigation options
Sourcing levers (supply-chain-screening) include source-tea specification favoring documented low-Pb tea suppliers; source-juice specification per fruit-juice sourcing; and refined-sugar specification (the operative source for the sugar substrate).
Agronomic levers (agronomic) operate at the source-tea and source-juice cultivation stages; see tea and camellia-sinensis for upstream interventions.
Processing levers (processing) include fermentation-vessel material specification — this is the dominant operative lever. Glass and stainless-steel fermentation vessels are required; ceramic, especially imported or hobbyist ceramic that may contain Pb-glazed surfaces, must be avoided. Commercial kombucha operations operate to stainless-steel and food-grade-plastic vessel specifications.
Formulation levers (formulation) include sweet-tea vs water-kefir substrate selection; non-tea-based fermented beverage bases avoid the tea-pathway Pb/Al inheritance entirely.
Testing and QC levers (testing-and-qc) include lot-level Pb, Al, Cd testing on finished fermented beverages. ICP-MS is the standard analytical platform.
Packaging and storage levers (packaging-and-storage) include glass-bottle packaging (standard for commercial kombucha); avoidance of aluminum cans which may interact with low-pH beverage and introduce Al migration; and avoidance of ceramic storage for finished product.
Regulatory limits that apply
- eu-2023-915 — EU Reg. 2023/915 does not set fermented-beverage-specific maximum levels; general EU food-safety law applies plus the lead-in-beverages context.
- FDA does not currently set quantitative action levels specific to fermented beverages; general FDA enforcement on toxic-element contamination and on improper home-fermentation practices applies.
- Codex Alimentarius CXS 193-1995 (Codex 1995) sets general beverage contaminant provisions.
- California Prop 65 (california-prop65) Pb MADL applies to fermented beverage products sold in California.
- The 2024 Munilla-García case report of Pb poisoning from kombucha fermented in ceramic containers (Munilla-García 2023) established a precedent for FDA and state-AG enforcement against improper ceramic-fermentation containers.
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.
| Commit | Date | Description |
|---|---|---|
| b0f3d38 | 2026-06-12 | batch | corpus rescreen b04 old terminal skips |