Bryan Johnson· Author
My sperm concentration (143 million) and count (380 million) both exceed 1973 levels demonstrating you can maintain high fertility in the modern world.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
My sperm concentration (143 million) and count (380 million) both exceed 1973 levels demonstrating you can maintain high fertility in the modern world.
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These personal-best fertility markers coincided with my first-in-human test result showing zero microplastics in my semen.
Total motile count: 411 million Motility: 64% Morphology: 12% Concentration: 212 million Count: 642 million To put these numbers into perspective: the WHO considers a motile count above 42 million as normal, mine is 411 million, nearly 10x. And a normal concentration is 16 million (mL), mine is 212 million (mL).
So from 2023 to 2025 concentration increased by 147%. Uh multileperm count increased by 32.5%. And then sperm uh with normal morphology increased by 233%.