Leave-on hair preparations (leave-in conditioners, tonics/dressings, styling aids, hair sprays, color sprays)
This page is a scaffolded entry for HMTc Taxonomy v2.0 Category 13 (Cosmetics and Personal Care — Leave-on), Row 11: Leave-on hair preparations (leave-in conditioners, tonics/dressings, styling aids, hair sprays, color sprays). Evidence ingest into this row is in progress; this page is the routing destination for source-page declarations of products: [leave-on-hair-preparations]. Sections below are populated by the routing layer (CLAUDE.md Part 5b) as sources land. Where a section is empty, the row has not yet accumulated contributing sources of the required kind.
Literature scope
The Heavy Metal Index source corpus is currently focused on food and food-contact materials. This page documents an HMTc Taxonomy v2.0 row in the category Cosmetics and Personal Care — Leave-on for which no peer-reviewed primary or government sources have yet been ingested. The page exists as the routing destination for future ingest. Until sources land, the literature-evidence sections below are deliberately empty rather than guessed; HMTc certification thresholds for products in this row continue to be developed under the certification program at heavymetaltested.com, not on this public page.
Who this page is for
- Brand legal teams
- What the peer-reviewed and regulatory literature reports for heavy-metal occurrence in Leave-on hair preparations (leave-in conditioners, tonics/dressings, styling aids, hair sprays, color sprays), with applicable regulatory caps and source-traceable findings. Use this page to evaluate certification or class-action exposure on a literature-anchored basis.
- Brand regulatory affairs / QA
- The current evidence base for Leave-on hair preparations (leave-in conditioners, tonics/dressings, styling aids, hair sprays, color sprays), the levers most-effective at reducing heavy-metal load, and the applicable regulatory limits with jurisdiction and basis.
- Retailers and category buyers
- The row-level assortment risk profile and where the literature distinguishes higher-risk from lower-risk product configurations within this row.
- 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 leave-on hair preparations (leave-in conditioners, tonics/dressings, styling aids, hair sprays, color sprays). Speciation is non-substitutable per CLAUDE.md Part 14 (iAs vs tAs, MeHg vs tHg, Cr-VI vs total Cr). Basis is preserved (finished-product as sold unless the source specifies otherwise; see each row for the basis label). Non-detect handling follows each source’s reporting convention. Pooling is avoided across LOD/LOQ, period, geography, and analytical-basis differences. HMT&C certification thresholds for products in this row are developed under the certification program at heavymetaltested.com, not on this page; this public page reports literature evidence only.
The applicable regulatory jurisdictions for this row are: FDA cosmetics, EU Cosmetics Regulation 1223/2009.
Literature Evidence Summary
Pending ingest. The routing layer will surface direct-row-fit sources here as they are added to the corpus with products: [leave-on-hair-preparations] in source-page frontmatter.
Source Evidence Inventory
Pending ingest. The routing layer populates this section from the source-page set declaring products: [leave-on-hair-preparations].
Broad Product Context: Author-Scope Index
Pending ingest. The routing layer surfaces sources whose author-stated scope is broader than this row (route_kind: broad_product_context) as they are added.
Federal/Regulatory Limits vs Field Findings
Pending ingest. The applicable regulatory jurisdictions for this row are recorded in the page frontmatter; the crosswalk table is generated by tools/apply-product-crosswalk-sections.mjs once regulation pages and field-evidence sources are routed to this row with structured limit values.
Levers to reduce contamination
Practical interventions to reduce heavy-metal load in this row, ordered by impact magnitude. Each lever names the magnitude of the effect with a cited source; cross-links to dedicated Mitigation pages where they exist.
- Sourcing levers — Pending ingest.
- Agronomic levers — Pending ingest. (See Agronomic mitigation for general agronomic mitigation context.)
- Processing levers — Pending ingest. (See Processing mitigation.)
- Formulation levers — Pending ingest. (See Formulation mitigation.)
- Testing and QC levers — Pending ingest. (See Testing and quality-control mitigation when published.)
- Packaging and storage levers — Pending ingest. (See Packaging and storage mitigation when published.)
How standards math uses this page
HMT&C certification thresholds for this row are developed under the certification program at heavymetaltested.com, not on this page. The row-standard for this row is an aggregate computed from the contributing source pool in the row’s native finished-product basis; it is not a per-source decoration of any single value cited on this page. This public page reports literature evidence only.
Historical recalls and enforcement
Pending ingest. Regulatory events (recalls, enforcement actions, import alerts) relevant to this row will be added as agency records are ingested into the corpus.
Sources
Pending ingest. The Source Legend below is auto-generated by tools/evidence/build-source-legend.mjs once source pages declaring products: [leave-on-hair-preparations] are added.
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 | Yorgwara et al. 2026. Assessment of Heavy Metal Concentration in Some Selected Cosmetic Products and Human Health Risk in Eleme LGA, Rivers State, Nigeria, Research Journal of Pure Science and Technology 9(2):20-37 | 2026 | Peer-reviewed | NG Pb, Cd, Cr, tAs, tHg, Co occurrence in Twenty-six cosmetic and personal-care products purchased from cosmetic stores and markets in Eleme LGA, Rivers State, Nigeria, grouped… (n=26) |
| 2 | Alblooshi 2025. The impact of perfumes and cosmetic products on human health: a narrative review, Frontiers in Toxicology 7:1646075 (Frontiers in Toxicology; published 29 August 2025; corrected 16 December 2025) | 2025 | Review | US/EU/CA Pb, Cd, tHg, tAs, Ni, Cr, Cr-VI occurrence in Single-author narrative review compiling peer-reviewed literature published 2005–2025 on health impacts of perfumes and cosmetic products. Sources drawn… |
| 3 | Tuladhar et al. 2024. Chemicals in Cosmetics Used by Washington Residents: Phase Two Results — Report to the Legislature Pursuant to ESSB 5693 (2022) Section 302 (56), Washington State Department of Ecology, Publication 24-04-022 (May 2024) | 2024 | Government report | This is the Washington State Department of Ecology legislative report’s Phase 2 deliverable under ESSB 5693 (2022) Section 302(56), the… |
| 4 | Washington State Department of 2024. Policy Statement: Interim Policy on Lead in Cosmetics — enforcement discretion under the Washington Toxic-Free Cosmetics Act (Chapter 70A.560 RCW), Washington State Department of Ecology, Publication 24-04-036 (issued December 19, 2024; minor revisions and clarifications January 15, 2025) | 2024 | Government report | US-WA Pb occurrence in Regulatory enforcement-discretion policy issued by the Washington State Department of Ecology under authority of the Toxic-Free Cosmetics Act… |
| 5 | Rbeida et al. 2023. Quality control of selected cosmetics marketed in Libya for traces of toxic heavy metals: urgent need of guidelines harmonization, Mediterranean Journal of Pharmacy & Pharmaceutical Sciences 3(3):1-8 (Article 117) | 2023 | Peer-reviewed | LY Pb, tAs, Cd, Ni occurrence in 12 cosmetic samples from public markets in Tripoli, Libya (winter 2022): 3 brands of Henna leaves (LEAV1-3), 3… (n=12) |
| 6 | Washington State Department of 2023. Chemicals in Cosmetics Used by Washington Residents — Report to the Legislature Pursuant to ESSB 5693 (2022) Section 302 (56), Washington State Department of Ecology, Publication 23-04-007 (January 2023) | 2023 | Government report | US/EU/DE Pb, Cd, tAs occurrence in 50 unique low-cost cosmetic products purchased July 2022 from four Puget Sound area retail chains (33 Walmart, 4… (n=50) |
| 7 | Almukainzi et al. 2022. Quality and safety investigation of commonly used topical cosmetic preparations, Scientific Reports 12:18299 | 2022 | Peer-reviewed | SA/US/EU Pb, Cd, tAs, Al, Cr, Cu, Ni, Fe, Zn, Mn, Co occurrence in Twenty-one topical cosmetic products purchased from local markets and drug stores in Riyadh, Saudi Arabia. Product selection was… (n=21) |
| 8 | Zafarzadeh et al. 2018. Assessment of cadmium and lead concentrations in different types of cosmetics products consumed in Iran, National Journal of Physiology, Pharmacy and Pharmacology 8(8):1200-1204 | 2018 | Peer-reviewed | IR/CN/TR Cd, Pb occurrence in 264 cosmetic products purchased from shops in Gorgan, Iran from September 2016 to March 2017: 24 samples each… (n=264) |
| 9 | U.S. Environmental Protection Agency, 2011. Exposure Factors Handbook: 2011 Edition — Chapter 17, Consumer Products, U.S. Environmental Protection Agency, EPA/600/R-09/052F | 2011 | Government report | Chapter 17 of the U.S. EPA’s 2011 Exposure Factors Handbook (EFH) compiles consumer-product use and exposure data — frequency of… |
| 10 | European Chemical Industry Ecology 1992. Nickel, Cobalt and Chromium in Consumer Products: Allergic Contact Dermatitis, ECETOC Technical Report No. 45, Brussels, March 1992 (ISSN 0773-8072-45) | 1992 | Industry | EU/US/IL Ni, Co, Cr, Cr-VI occurrence in Literature-review compilation of nickel, cobalt and chromium concentrations measured in consumer products by 28 published studies (1956-1990) and… |
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 |
|---|---|---|
| ae6c129 | 2026-07-01 | feat(auth): large login + role-based signup screens (design, burgundy) |