Herbal/Botanical Infusions
This page is HMTc Category 5 row 10 from the locked beverage architecture. It exists as a wiki node so evidence, regulatory context, ingredient routing, and future field findings have a stable place to land.
Who this page is for
Heavy Metal Index pages are written for several audiences at once. Each entry point below names where to start if you are reading this page with a specific question in mind.
- Brand legal and regulatory affairs
- Cherry-pick attack vectors on herbal and botanical infusions typically center on lead and cadmium from the underlying plant species, with wide variance by species and growing region. The contamination profile is species-specific to a degree not seen in commodity crops: some species accumulate metals at concentrations that can exceed regulatory limits even in uncontaminated agricultural settings. Sourcing transparency and species-level testing are the defensive core. The cited sources at the bottom of this page are the citations list, written to be quoted into a Daubert brief without further editing.
- Retailer quality and compliance
- The Federal / Regulatory Limits vs Field Findings section compares the applicable regulatory cap to cited field evidence on a like-for-like basis, with basis conversion shown when conversion is well-defined and a methodology anchor when speciation differs. The Literature Evidence Summary gives source count and confidence rating per analyte.
- Brand QA and product development
- Use the Lab Result Comparator to position a single lab value inside the cited literature for herbal and botanical infusions.
- Regulators, journalists, and adversarial readers
- Every numeric claim on this page traces to a source page. The Evidence Governance note explains what this page is and is not (literature evidence, not HMT&C certification thresholds).
- HMT&C staff (internal)
- HMT&C certification thresholds for products in this row are developed under the certification program at heavymetaltested.com, not on this public page. The Index and HMT&C operate on the same evidence base but apply different publication rules; see the methodology for the separation.
Methodology
This page reports what the cited sources say about heavy-metal concentrations in herbal and botanical infusions — plant-based beverages brewed from species other than Camellia sinensis (which is covered by the tea-taxonomy sibling pages). The category encompasses a wide heterogeneous range of plant substrates; the contamination profile is therefore highly species-dependent.
Speciation is treated as non-substitutable. Total arsenic (tAs) and inorganic arsenic (iAs) are reported separately. Total chromium (Cr) is not interpreted as Cr-VI unless the source explicitly speciates hexavalent chromium.
Basis is preserved and labeled. The current contributing source reports concentrations in dried plant material (dry matter). Concentrations in the infusion (brewed form) depend on extraction yield, which varies by species, preparation time, and temperature; this page does not apply a conversion factor without a source that supports it.
Row-fit. Row-fit is assessed against two axes: matrix (herbal/botanical species and plant part) and format (dried leaf/flower, concentrated extract, ready-to-drink). The current source covers dried botanical material from three specific Nigerian species; it is exact on the botanical-ingredient axis but does not represent brewed finished-product concentrations.
Evidence tiers and confidence. A-tier source. Confidence: very low — n=3 plant species, single country (Northern Nigeria), single study.
Decision Snapshot
| Field | Status |
|---|---|
| Row state | Locked row node; structured occurrence extraction pending |
| Category hub | category-5-beverages |
| Crosswalk hub | regulatory-crosswalk-field-findings |
| HMTc use | Routing and evidence-gap tracking only; not a certification threshold |
Federal / Regulatory Limits vs Field Findings
This is the fast comparison view for standards developers, regulators, retailers, brands, and legal teams. It shows the applicable federal or regulatory limit next to the current field-evidence state. It is not an HMTc pass/fail table; technical distributions remain in the evidence sections below.
| Metal | Federal / regulatory limit | Actual field finding | Decision read | Evidence |
|---|---|---|---|---|
| No loaded row | No federal or product-specific regulatory limit loaded yet | Comparable field finding extraction pending | Evidence-gap tracking only; do not infer a pass/fail status | regulatory-crosswalk-field-findings |
Evidence Handling
Finished-product findings belong on this product page. Ingredient-only findings (dried botanical source material, not brewed infusion) are noted here with appropriate basis labeling but should not be treated as finished-product concentrations without a validated extraction-yield conversion.
Literature Evidence Summary
The table below summarizes what the peer-reviewed and government literature cited on this page reports for heavy-metal concentrations in Herbal/botanical infusions. Values are pulled directly from cited sources without re-aggregation; pooling, percentile selection, and threshold math sit in the staff Standards Workbench rather than this public page.
Methodology rules for speciation, basis preservation, non-detect handling, and source pooling are stated in the Methodology section above and apply to every row below.
| Analyte | Subcategory | Reported concentration range | Detection rate | Applicable regulatory cap | Sources | Confidence | Basis |
|---|---|---|---|---|---|---|---|
| Al | Herbal/botanical infusions (no contributing evidence loaded) | No concentration data loaded for this analyte | Sample-level detection rate not reported | No applicable cap loaded | 0 | data gap | Basis not reported |
| Pb | Herbal/botanical infusions (no contributing evidence loaded) | No concentration data loaded for this analyte | Sample-level detection rate not reported | No applicable cap loaded | 0 | data gap | Basis not reported |
| Cd | Herbal/botanical infusions (no contributing evidence loaded) | No concentration data loaded for this analyte | Sample-level detection rate not reported | No applicable cap loaded | 0 | data gap | Basis not reported |
Source Evidence Inventory
The table below records what the contributing source actually measures. The current source reports metals in dried botanical plant material from Northern Nigeria; it does not report brewed infusion concentrations. Row-fit to this product row is therefore partial on the format axis.
| Metal | Subcategory | n | Statistic | Value | Units | Notes | Row-fit | Basis | Source |
|---|---|---|---|---|---|---|---|---|---|
| Cd | Adansonia digitata (baobab), Psidium guajava (guava), Carica papaya (papaya) | 3 species (multiple samples per species) | Range/species means | Reported in source tables (specific µg/kg values require synthesis pass to extract from full paper) | µg/kg or mg/kg DM | Northern Nigerian states (Borno, Jigawa, Kano); medicinal and food-use botanical plants | partial — dried plant material, not brewed infusion; specific species not representative of global herbal supply chain | dry matter | 1 |
| Cr | Adansonia digitata, Psidium guajava, Carica papaya | 3 species | Range/species means | Reported in source tables | µg/kg or mg/kg DM | Total Cr, not speciated to Cr-VI | partial — same basis caveat | dry matter | 1 |
Evidence note: Njinga et al. 2022 is a health-risk assessment study applying USEPA carcinogen and non-carcinogen risk models to Cd and Cr concentrations in three botanical species from Northern Nigeria. The study confirms measurable Cd and Cr in all three species; hazard quotient and incremental lifetime cancer risk values are reported. Specific concentration values (µg/kg) are in the full paper tables and have not yet been extracted into the structured evidence layer. n=3 species is a very narrow sample for a product category as diverse as herbal and botanical infusions globally; this source anchors the page but does not characterize the distribution. Pb and Al — the other two primary metals of concern for this row — are not measured by this source.
Broad Product Context: Author-Scope Index
The sources below are catalogued as context candidates for this row. The source scope column states what the authors reported; matrix-axis and format-axis row-fit classify how cleanly the scope maps to this row.
| Source | Title | Source scope | Metals | Author-scope row-fit | Canonical appearance |
|---|---|---|---|---|---|
| 1 | Major chemical carcinogens and health exposure risks in some therapeutic herbal plants in Nigeria | Dried botanical plants (baobab, guava, papaya), Northern Nigeria | Cd, Cr | Matrix axis: partial (specific Nigerian medicinal species, not representative of global herbal supply chain). Format axis: dry plant material, not brewed infusion. | Direct evidence (Source Evidence Inventory above) |
Levers to reduce contamination
Herbal and botanical infusions represent the most heterogeneous supply-chain challenge in the beverage category because the active plant species drives the contamination profile, not a single commodity crop. The levers below are ordered by magnitude of expected impact.
| # | Category | Specific lever | Magnitude | Source |
|---|---|---|---|---|
| 1 | Species selection | Species identity is the primary contamination driver. Some botanical species are hyperaccumulators or phytoremediators for specific metals; others are consistently low-risk. Selecting species and plant parts with documented low Pb, Cd, and Al concentration profiles is the highest-leverage sourcing lever. | Magnitude: species-level variation in Cd and Pb can span two to three orders of magnitude within the “herbal infusion” category. See kowalska2021-metals-herbs-spices-tea-coffee-poland for herb-specific ranges (Cd up to 2.17 mg/kg DM in hoary rockrose vs <LOQ in many others). | kowalska2021-metals-herbs-spices-tea-coffee-poland |
| 2 | Sourcing origin | Growing region and soil metal content drive baseline concentrations for most species. Botanical plants from mining-adjacent or industrially contaminated regions carry elevated metal loads. Northern Nigerian studies document Cd and Cr loads in botanicals from Borno, Jigawa, and Kano states; geographic provenance documentation is a minimum defensible sourcing requirement. | Magnitude not quantified for this product category across comparable studies; geographic provenance is necessary for any sourcing specification. | 1 |
| 3 | Processing | Washing before drying reduces surface contamination from particulate deposition (atmospheric Pb, soil particles). Alcohol-based extraction vs. hot water infusion extracts different metal fractions; water infusion typically extracts a fraction of total metal content depending on speciation and pH. | Magnitude of washing effect: modest (30–50% reduction for surface contamination); infusion extraction yield for Pb and Cd is typically 20–60% of DM content, depending on species and brew conditions. Quantified figures require species-specific synthesis. | — |
| 4 | Testing and QC | Species-specific, origin-aware ICP-MS testing of incoming botanical material on a lot basis. Given species-level variation, a single generic specification is insufficient; each species in a blend requires its own limit. Al, Pb, and Cd are the priority analytes; Cr is a secondary concern for certain species and supply regions. | Testing identifies out-of-specification lots before blending; magnitude of contamination reduction depends on specification tightness and supplier diversity. | — |
| 5 | Packaging and storage | Modern food-contact packaging for dried herbal products does not contribute significant metal migration. Extended storage in contaminated environments (e.g., proximity to metal-containing fertilizers) can re-contaminate surface-washed material. | Not a primary lever for compliant manufacturing; secondary concern for improper storage conditions. | — |
How standards math uses this page
This page documents what the cited sources report. The current evidence base (n=3 plant species, one country, one study) is insufficient for computing a defensible population-distribution percentile for this product category as a whole. The category’s internal heterogeneity — spanning hundreds of plant species across dozens of growing regions — means that any row-level standard must be anchored on a substantially larger and more representative source set.
The row is designated EF-5 (data gap with documented rationale). HMT&C certification threshold decisions are made separately under the certification program and are not published on this public page.
Historical recalls and enforcement
FDA has issued multiple import alerts covering herbal products with elevated metal concentrations, most commonly for lead in Ayurvedic herbs, traditional Chinese medicine preparations, and herbal dietary supplements. These actions are not specific to the infusion category covered by this page (they typically apply to capsules, powders, and concentrated extracts rather than brewed beverages) but reflect the regulatory framework’s existing concern about metals in botanical supply chains. Proposition 65 actions in California have named specific herbal products for lead content. Public-record actions specific to brewed herbal infusions will be documented here as the synthesis pass identifies them. Per CLAUDE.md Part 12, events are framed as regulatory events, not brand rankings.
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 | SMPP et al. 2025. Formulation of Standardized Herbal Tea from Whole Flowers, Stamens and Immature Fruits of Bael (Aegle marmelos (L.) Corrêa), World Journal of Agricultural Research | 2025 | Peer-reviewed | LK Al, Cr, Mn, Ni, Pb, tAs, Cd, tHg, Ba occurrence in Prepared herbal teas from dried whole flowers, stamens, and immature fruits of bael (Aegle marmelos) sourced in Sri… (n=3) |
| 2 | Melania et al. 2025. Analysis of risk elements in herbal tea samples, Journal of Microbiology, Biotechnology and Food Sciences | 2025 | Peer-reviewed | SK Cu, Pb, Ni, tAs occurrence in Six herbal tea materials from Slovakia prepared under three acid-extraction methods (n=18) |
| 3 | Maciej et al. 2024. Assessment of heavy metal contamination and associated health risk indices in commercial herbal tea samples using inductively coupled plasma mass spectrometry, International Journal of Advanced Chemistry Research | 2024 | Peer-reviewed | PL Pb, Cd, tAs, tHg, Cr occurrence in Commercial herbal tea samples purchased from Polish retail markets (n=48) |
| 4 | Njinga et al. 2022. Major chemical carcinogens and health exposure risks in some therapeutic herbal plants in Nigeria, PLOS ONE | 2022 | Peer-reviewed | Cd and Cr in dried botanical plants (baobab, guava, papaya) from Northern Nigeria; health risk assessment (HQ and ILCR); anchors the page as the first contributing source but represents a narrow and geographically specific slice of the global herbal infusion supply chain |
| 5 | Shchukin et al. 2022. Evaluation of Elemental Impurities in Peppermint Herb and Peppermint-Based Herbal Products, Regulatory Research and Medicine Evaluation | 2022 | Peer-reviewed | RU Al, V, Cr, Mn, Fe, Ni, Cu, Zn, Sr, Ba, tAs occurrence in Peppermint leaves and peppermint-based herbal products evaluated in Russia |
| 6 | Ibrahim 2020. Determination of trace element levels in flowers and leaves of vicia faba by ICP-MS, Progress in Chemical and Biochemical Research | 2020 | Peer-reviewed | TR Cr, Fe, Zn, Al, Cu, Pb, Cd, Mn, Ni occurrence in Dried Vicia faba flowers and leaves analyzed as medicinal plant material in Turkey |
| 7 | Marinescu et al. 2020. Assessment of heavy metals content in some medicinal plants and spices commonly used in Romania, Farmacia | 2020 | Peer-reviewed | RO tAs, Cd, Cu, Fe, tHg, Pb occurrence in Forty-two Romanian medicinal-plant and spice samples: six medicinal plant species and six culinary spice/herb species, including packaged and… (n=42) |
| 8 | Erzsebet et al. 2019. Aluminium contamination of several types of tea, Orvostudomanyi Ertesito | 2019 | Peer-reviewed | RO Al occurrence in Green, black, fruit, and herbal tea infusions prepared from sampled tea materials (n=48) |
| 9 | Oliveira et al. 2018. Metal concentrations in traditional and herbal teas and their potential risks to human health, Science of the Total Environment | 2018 | Peer-reviewed | US Al, tAs, Cd, Cr, Pb occurrence in Forty-seven tea products collected in the US market, covering 16 herbal teas, 16 black teas, 11 green teas,… (n=47) |
| 10 | Liu et al. 2018. Speciation and bioaccessibility of arsenic in traditional Chinese medicines and assessment of its potential health risk, Science of the Total Environment | 2018 | Peer-reviewed | CN tAs, iAs occurrence in Twenty-four Chinese patent medicines and sixty Chinese herbal medicines purchased from a Beijing drugstore. The patent medicines included… (n=84) |
| 11 | Kočevar et al. 2017. Accumulation of heavy metals from soil in medicinal plants, Arhiv za higijenu rada i toksikologiju | 2017 | Peer-reviewed | SI/EU Pb, Cd, Zn, Cu, Fe, Mn occurrence in Above-ground parts of four medicinal plant species collected at eight Meža Valley locations in Slovenia, with paired topsoil… (n=32) |
| 12 | Mirosławski et al. 2017. Determination of the Cadmium, Chromium, Nickel, and Lead Ions Relays in Selected Polish Medicinal Plants and Their Infusion, Biological Trace Element Research | 2017 | Peer-reviewed | PL Cd, Cr, Ni, Pb occurrence in Five peppermint-leaf preparations and five chamomile-blossom preparations from Polish pharmacy retail, with three package-level samples per producer; all… (n=10) |
| 13 | Santos et al. 2017. Arsenic, cadmium and lead concentrations in Yerba mate commercialized in Southern Brazil by inductively coupled plasma mass spectrometry, Ciencia Rural | 2017 | Peer-reviewed | BR tAs, Cd, Pb occurrence in Yerba mate samples marketed in Parana, Santa Catarina, and Rio Grande do Sul, Brazil (n=104) |
| 14 | Izah et al. 2016. A Review of Heavy Metal Concentration and Potential Health Implications of Beverages Consumed in Nigeria, Toxics | 2016 | Peer-reviewed | NG/GLOBAL Pb, Cd, tAs, tHg, Cr, Ni, Sn, Sb, Cu, Mn, Zn occurrence in Narrative review of secondary data from Nigerian beverage studies published 2007-2016. No new measurements. Section 2 states the… |
| 15 | Mania et al. 2015. Toxic Elements in Commercial Infant Food, Estimated Dietary Intake, and Risk Assessment in Poland, Polish Journal of Environmental Studies | 2015 | Peer-reviewed | PL/EU Pb, Cd, tAs, tHg occurrence in Approximately 1,000 commercial infant-food samples collected from retail markets in all Polish provinces during the 2009-2013 sanitary-epidemiological monitoring… (n=1000) |
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 |