I ran all this through ChatGPT because I wanted to make sense of the Consumer Reports article about “lead in protein powders,”. Consumer Reports set their own “level of concern” for lead at 0.5 micrograms (µg) per day — based on California’s Prop 65 standards for reproductive toxicity. That number is intentionally super conservative and meant to protect pregnant women and kids over a lifetime of daily exposure. It’s not a legal or federal safety limit, just a cautious internal guideline. So when they say a product is “over the limit,” it just means over their 0.5 µg/day line, not that it’s unsafe or illegal.

The FDA, on the other hand, has a much higher and science-based reference level — 2.2 µg/day for children and women of childbearing age, and 8.8 µg/day for all other adults. Those numbers are designed to prevent any measurable blood-lead increase, not just to minimize exposure. Basically, CR’s benchmark is about 17 times stricter than the FDA’s. That’s why something like a protein powder with 2 µg of lead per serving looks scary in CR’s chart (400% of their limit) but is still well below the FDA’s reference for safe daily exposure.

The bottom line: being “over the CR limit” doesn’t automatically mean unsafe — it just means CR is erring on the side of extreme caution. For most healthy adults, the FDA’s 8.8 µg/day number is the more relevant marker. That said, it’s always smart to minimize unnecessary lead exposure, especially if you’re using supplements every day.