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Biohackers Are Convinced Icing Their Balls Will Supercharge Their Sperm

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Bryan Johnson has tracked his erections, injected his son’s plasma, monitored his girlfriend’s vaginal microbiome, and eaten the same 2,000-calorie meal every day for years. His latest experiment involves ice packs on his testicles, and now half a million people on Reddit are following suit.

Johnson, the billionaire biohacker behind Project Blueprint, claims that 27 daily sauna sessions with an ice pack strapped to his groin produced a 57% increase in total motile sperm count, a 26% jump in concentration, and improvements across morphology and motility. He posted the numbers to X himself, describing the ice protocol as the single most important variable in his sauna routine. He also says he has four times the average sperm count. These are his own figures, from his own experiments, on himself.

The Reddit biohacking community, which draws over 555,000 weekly visitors, has been running its own informal trials. “My protocol is........

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