Bryan Johnson· Author
My standard daily protocol was 20 minutes. That wasn’t enough time to get my core body temp to the heat shock threshold of 102.2°F (39.0°C).
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Direct evidence is thin. The claim is plausible and aligns with adjacent findings, but there isn't yet a body of high-quality work that would let us call it well-supported on its own terms.
My standard daily protocol was 20 minutes. That wasn’t enough time to get my core body temp to the heat shock threshold of 102.2°F (39.0°C).
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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4–7 sauna sessions per week, 20 minutes at 80°C+, reduce cardiovascular mortality risk by 40% over a decade.
Regular sauna use raises BDNF and improves verbal memory in older adults.
Sauna protocols only generate the longevity effect when sessions exceed 30 minutes.
Hot-tub bathing yields cardiovascular benefits comparable to traditional Finnish sauna at matched core-temp dose.