Bryan Johnson's Menstrual Blood Research Sparks Biohacking Spotlight

American tech entrepreneur Bryan Johnson disclosed that he keeps approximately 10 ml of his girlfriend Kate Tolo's menstrual blood frozen at –80 °C. He argues the sample provides a direct, non‑invasive view of the uterus, allowing analysis of uterine cells, immune cells, stem cells, micro‑plastics, PFAS and other endocrine‑disrupting chemicals that standard blood tests may miss. Johnson says this practice is part of his broader longevity research funded through his company Immortals.

Johnson also revealed an intensive data‑collection regimen for Tolo, aiming to compile around 14 million data points on her menstrual cycle – a project he claims is a "world first" for women's health. Over a typical day, Tolo undergoes continuous monitoring with roughly 50 devices, including a "techno tampon" that tracks blood flow, frequent blood draws, urine samples, hormone measurements, sleep and metabolic tracking, and physical assessments. The effort, financed by Immortals, reflects Johnson's $2‑million‑a‑year anti‑aging program and his push to generate the most comprehensive female menstrual‑cycle dataset ever recorded.