Bryan Johnson Freezes Girlfriend's Menstrual Blood in Biohack
Bryan Johnson stored 10 mL of girlfriend Kate Tolo's menstrual blood at -80°C for research, as announced in a July 31, 2026 post.
Experts say menstrual samples contain endometrial cells and immune cells, making them valuable for studying conditions like endometriosis and reproductive health.
Johnson plans to test the sample for contaminants including microplastics, PFAS, and endocrine-disrupting chemicals, which researchers link to reproductive health effects.
Dr Prajna Shetty noted that studying menstrual effluent is a non-invasive research method, but finding contaminants in one sample does not prove causation.
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