Andrew Huberman
Huberman discusses sperm-count reductions with repeated heat exposure and mentions cooling packs as an option during sauna use.
THE SCIENCE
Temperature matters.
A closer look at heat, cooling and male reproductive health.
2–3°C
below core body temperature
Cooler by nature.
The testes typically operate below core body temperature, supporting sperm production.
IN THE CONVERSATION
Heat. Cooling. Sperm health.
Bryan Johnson
Johnson shares semen-test results from his sauna and cooling routine. These are personal observations, rather than a controlled clinical trial.
These sources discuss heat and cooling; neither is presented as an endorsement or test of Frio Protocol.