Bryan Johnson· Author
Human testes operate at 2 to four degrees C cooler than core body temperature. Even a 2° C rise can derail spermaltogenesis, the process of producing sperm for 74 days or a full cycle.
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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.
Human testes operate at 2 to four degrees C cooler than core body temperature. Even a 2° C rise can derail spermaltogenesis, the process of producing sperm for 74 days or a full cycle.
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