Bryan Johnson· Author
Semen quality isn’t just about reproduction. It’s one of the clearest biomarkers of systemic aging: tightly linked to hormone health, inflammation, mitochondrial function, and metabolic fitness.
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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.
Semen quality isn’t just about reproduction. It’s one of the clearest biomarkers of systemic aging: tightly linked to hormone health, inflammation, mitochondrial function, and metabolic fitness.
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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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