Biohacker Bryan Johnson freezes girlfriend's menstrual blood for health research

Bryan Johnson shared on X that he has stored roughly 10 mL of his partner Kate Tolo’s menstrual blood at -80 °C, describing it as a valuable, underused resource for monitoring the uterine environment. He plans to test the sample for diseased tissue, microplastics, endocrine disruptors and PFAS, arguing that it provides cycle-by-cycle data without surgery. Meanwhile, Tolo, 30, is undertaking an intensive 100-day effort to capture 14 million data points on her cycle, a $2.6 million initiative aimed at filling gaps in female reproductive-health research after her diagnoses of endometriosis and polyendocrine metabolic ovarian syndrome.

Johnson, who recently disclosed his own autoimmune gastritis, said his goal is to cure both his and Tolo’s ailments through AI and biotech, bypassing reliance on large pharmaceutical firms. He also highlighted Tolo’s unusually high L. crispatus dominance in her vaginal microbiome. The couple has been documenting their experiments publicly for the past three years.