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.
What they found was that doing sauna once and then waiting some period of time and then later that day doing sauna again, they didn't see the same increase in growth hormone both times. First they got a big increase in growth hormone and then less if they did sauna again.
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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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If you start doing deliberate heat exposure more often, you'll still get increases in growth hormone, but they are not going to be nearly as large as the increases in growth hormone that you're going to experience if you shock your system with deliber deliberate heat exposure every once in a while.
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.