Bryan Johnson· Author
+ Brain + Cortical thickness and volume restored toward youthful levels: SRC up to ~50–70% vs WTC ~10–20% (inferred from imaging and figure analysis; not direct author statistics).
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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.
+ Brain + Cortical thickness and volume restored toward youthful levels: SRC up to ~50–70% vs WTC ~10–20% (inferred from imaging and figure analysis; not direct author statistics).
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.
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+ Cognition: significant improvement with SRC; modest effect with WTC.