Kate Tolo, the 30-year-old partner of biohacker Bryan Johnson, is turning her own body into a commercial research project. With $2.6 million in funding from Immortals, the wellness company the two founded, Tolo is tracking more than 1,500 biomarkers from blood, urine, and stool across her menstrual cycle. She says the goal is to develop reliable, noninvasive diagnostics for endometriosis, a condition she suspects she has had since her teens but has never had surgically confirmed.
Tolo and Johnson claim they diagnosed her endometriosis in 42 days using a saliva test, a blood test, and an endo-specific ultrasound—without the laparoscopy that doctors consider the diagnostic gold standard. Their next step is creating an organoid from cells in her menstrual blood, essentially testing treatments on a lab-grown version of her own tissue. They have not named the lab they are working with, saying it prefers to remain anonymous.
Medical experts remain cautious. Kristin Riley, chief of minimally invasive gynecological surgery at Penn State Health, notes that while clinical diagnosis is possible, surgery is still the standard for confirming endometriosis. The broader market is already moving toward simpler tests: in the UK, a saliva-based diagnostic called Endotest was recently approved for temporary clinical use. Tolo’s venture is distinct in its scale and celebrity backing, but it has yet to publish independent validation of its methods.