Selling supplements in California means addressing California's Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1986), a state law that requires clear and reasonable warnings if a product exposes consumers to listed chemicals above established Safe Harbor levels (such as the Maximum Allowable Dose Level of 0.5 micrograms/day for lead). For dietary supplements, the most common concerns are naturally occurring heavy metals like lead, cadmium, arsenic, and mercury in botanical, mineral, and plant-protein ingredients.
Prop 65 compliance requires proactive evaluation because 60-day notices of violation and private enforcement lawsuits can be filed even when trace heavy metals occur naturally in agricultural ingredients. Settlements and legal defense are expensive, and many natural channel retailers restrict or decline products that carry a Prop 65 warning label.
At Blue Ocean Regulatory, we help brands manage Prop 65 exposure by building a testing and sourcing strategy tailored to their formulas. We evaluate finished-product testing data against daily serving exposure, assess when OEHHA safe-harbor warnings are legally required, and work with manufacturers to tighten raw material specifications or reformulate high-contributing ingredients where feasible.
In practice, when a plant-based protein powder or botanical blend tests near or above California's daily lead threshold on a per-serving basis, evaluating each raw material lot individually often identifies the specific ingredient driving the exposure. Tightening supplier heavy-metal specifications or qualifying an alternative raw material source can bring finished-product exposure below the warning threshold before launching into California retail or national e-commerce.
For brands selling into California—including any brand selling nationwide online—proactive Prop 65 testing and specification control reduces litigation risk and keeps retail distribution options open.