Your Balls Are Full of Plastic: Does Bryan Johnson know how to get them out?
Tech founder Bryan Johnson says he’s managed to slash ~85% of the microplastics in his semen and yes, he’s been openly sharing the how and the why. According to his numbers, he went from roughly 165 microplastic particles per mL in November 2024 down to ≈20 particles/mL by July 2025.
His claim: the same dramatic drop showed up in his blood too—he reports a fall from ~70 particles/mL to ~10 over the same period. He believes this shows a connection between microplastic levels in the bloodstream and those in reproductive fluids.
So how did he do it?
His reported regimen includes:
Daily dry-sauna sessions: a hot 200 °F sauna for ~20 minutes per day, while applying an ice pack to his groin, ostensibly to protect sperm health during the exposure.
Avoiding common plastic exposures: no microwaving in plastic containers, no plastic cutting boards, switching to a reverse-osmosis water filter to reduce ingestion of microplastics.
Tracking biomarkers and his own body metrics with high frequency, as part of his longevity / biohacking program.
That said, the science is very much still emerging. Experts caution that:
While microplastics are found in human tissues, organs and fluids including semen and blood, we don’t yet have strong evidence for what “detoxing” them via sauna or other means actually does for health.
Saunas, especially at high heat, are not without risk: e.g., high testicular temperature is known to reduce sperm quality and production, so combining a sauna + ice-pack trick is unconventional and not thoroughly studied.
Johnson’s data is single‐person, self‐reported, and lacks independent, peer-reviewed verification. So take it as an intriguing case study, not as conclusive proof.
In short what Bryan Johnson is spotlighting is a legit concern—microplastics everywhere, in bodies and environments. But his bold claims come with a caveat: extreme regimen, high cost, limited scientific backing so far.
So if you’re interested in reducing microplastic exposure or improving reproductive health, there are solid, accessible steps (like avoiding plastics in food contact, using good water filters).
But applying a full sauna-plus-ice-pack “detox” like Johnson’s? That’s still experimental.
