A Vision of Chocolate's Future in an Amsterdam Brownie

It seems that eating one serving a day is fine. Everything has trace levels of metals. Rice has high arsenic but it doesn’t seem to affect the longevity of the Japanese. Here is a summary from one paper that tested lots of chocolate.

> This indicates that heavy metal contamination—in more than half of products tested—may not pose any appreciable risk for the average person when consumed as a single serving; however, consuming some of the products tested, or more than one serving per day in combination with non-cocoa derived sources heavy metals, may add up to exposure that would exceed the Prop 65 MADLs. Notably, “organic” products were significantly more likely to demonstrate higher levels of both Cd and Pb.

https://pmc.ncbi.nlm.nih.gov/articles/PMC11321977/

The organic part is interesting and something most people probably don’t realize. I used to grow medical marijuana for a living and the people that failed their heavy metals testing were always growers that grew organic. The metals bioaccumulate and when you use manure or fish meal or whatever you are increasing the heavy metal content of your crop compared to using pure synthetic fertilizer, which has much lower trace metal contamination.