How I Became The World's Healthiest Human | Bryan Johnson Podcast

20 May 2025 · 38 min
37:34

Bryan Johnson tracks dozens of biomarkers to measure his biological age, from sperm count to bone density to epigenetic clocks. His sperm metrics are several times above average despite a 50-year decline in male fertility. He uses 90-day measurement cycles to test interventions like sauna and scrotal cooling, treating his body as a personalized experiment.

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