California Proposition 65 is not a product certification and is not a single label rule for every U.S. market. It concerns potential exposure to chemicals on California’s Proposition 65 list and the duty to provide a clear and reasonable warning where applicable. A cross-border file should connect the product formulation, materials, use scenario, California sales scope, and warning presentation.
1. Define the Proposition 65 scope first
The central question is whether a business, in the course of doing business, knowingly and intentionally exposes an individual to a chemical listed by California as causing cancer or birth defects or other reproductive harm. The review should trace possible chemicals, materials and formulations, exposure routes, expected use, and whether the product enters the California market.
OEHHA maintains and updates the list. Listed chemicals may come from additives, raw materials, dyes, solvents, or manufacturing byproducts. A match to the list does not by itself establish that a warning is required; the exposure facts, any applicable safe-harbor level, and the current warning rules must also be considered.
2. Separate the duty to warn from safe-harbor levels
When a business determines that a warning is required, it must provide a clear and reasonable warning before the exposure. OEHHA safe-harbor levels include NSRLs for carcinogens and MADLs for reproductive-toxicants. Meeting an applicable safe-harbor level is not a certification and does not replace documentation of the actual exposure scenario. Where no safe-harbor number exists, the business still needs a defensible assessment under the rules and may need qualified advice.
Warning regulations explain how a safe-harbor warning may be provided; they do not automatically decide whether a warning is necessary. Check the warning wording, chemical name, symbol, placement, and online presentation for the product type and the current Title 27 rules. Do not apply one generic template to every SKU.
3. Build a traceable SKU evidence map
Product and parties: SKU, variants, material or formulation version, manufacturer, brand owner, importer or seller, sales territory, and page version.
Chemicals and exposure: ingredient or additive lists, BOM or formulation, supplier declarations, test reports, possible contact, inhalation, or ingestion routes, frequency of use, and reasonably relevant scenarios. Evidence should identify the SKU and version rather than rely on a general supplier statement.
Warning presentation: retain the wording, location, language, visibility, and release date for packaging, labels, instructions, product pages, and catalogs. Online and physical warnings should have separate version records.
Change control: reassess the listed chemicals, exposure, and warning applicability when materials, formulations, factories, suppliers, packaging, pages, or sales territories change.
4. Keep page language within evidence boundaries
Do not turn a warning about potential exposure to a listed chemical into a statement that a product is unsafe, certified, or risk-free. Avoid unsupported fine percentages, fixed review periods, guaranteed delisting, or guaranteed approval. A Proposition 65 warning also does not prove compliance with other state or federal laws, marketplace rules, or buyer requirements.
5. Pre-submission checklist
Confirm that the current OEHHA list and warning rules were used; confirm that the listed chemical, product version, and exposure route are supported; ensure a safe-harbor assessment has not been rewritten as a certification conclusion; align package, instruction, and online warning versions; and retain party, date, sample or model, and change-control records. This is a reference framework; the actual product and sales arrangement determine the applicable review.
Official sources
OEHHA: The Proposition 65 List
OEHHA: Businesses and Proposition 65
OEHHA: Clear and Reasonable Warnings
OEHHA: Proposition 65 Law and Regulations
