Why mercury has no Prop 65 safe harbor level
Listed three times since 1987, quantified zero times: OEHHA has never adopted a MADL or NSRL for mercury. What the missing number shifts onto businesses, buyers, and enforcement.
Consumer Safety Research Center — Journal
Plain-language writing on heavy metals in food, Proposition 65, and independent laboratory testing. Published as it clears review — no noise.
Listed three times since 1987, quantified zero times: OEHHA has never adopted a MADL or NSRL for mercury. What the missing number shifts onto businesses, buyers, and enforcement.
Every CSRC finding follows the same documented chain: a retail purchase, an accredited laboratory, a published exposure calculation, and an expert's signature. Here is each step, and why it's built to survive a courtroom.
You've seen the sign on parking garages and coffee shops. On a food label, it means something more specific — and its absence can mean more than its presence.
It isn't an accident, and it isn't a conspiracy — it's agronomy plus concentration plus serving size. What the research shows, and what a careful consumer can actually do.
0.5 micrograms of lead per day. Where that number comes from, what the 1,000-fold safety factor means, and why "over the limit" and "dangerous" are different claims.
Brands increasingly publish "COAs" as proof of purity. Some prove a lot, some prove almost nothing. A working guide to reading one like an auditor.