Bryan Johnson· Author
I had 10 popular dark chocolate brands independently tested for heavy metals (arsenic, lead, cadmium, and mercury), and healthy cocoa flavanols.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
I had 10 popular dark chocolate brands independently tested for heavy metals (arsenic, lead, cadmium, and mercury), and healthy cocoa flavanols.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
most companies don't share the results of heavy metals you don't know how much you're consuming