Biohacker Bryan Johnson has revealed that he is storing approximately 10 milliliters of his girlfriend Kate Tolo's menstrual blood in his freezer. Johnson, known for his public quest for longevity, described the sample as a "valuable and underutilized" resource for understanding female health.
He stated on X that the stored menstrual blood provides a "non-invasive look into the uterus," offering a direct measure of the uterine environment without the need for surgical biopsies. Johnson plans to analyze the sample for signs of diseased tissue, microplastics, endocrine disruptors, and per- and polyfluoroalkyl substances (PFAS), also known as "forever chemicals."
This initiative coincides with Tolo's ongoing 100-day project to gather 14 million data points on her menstrual cycle. This effort, described as a $2.6 million undertaking, aims to address significant gaps in medical research concerning female reproductive health. Tolo expressed that the project is a path toward ensuring women are "understood in the world and being seen."
The couple's focus on female health is partly driven by Tolo's diagnoses of endometriosis and polycystic ovary syndrome (PCOS). Johnson has previously highlighted that endometriosis, a condition affecting at least 1 in 10 women, often takes years to diagnose. He also shared that Tolo's vaginal health test indicated a high presence of Lactobacillus crispatus, a protective bacterial species.
Johnson, a venture capitalist, has stated his goal is to heal individuals and utilize AI and biotechnology to combat diseases, asserting that waiting for large corporations is unnecessary. He aims to address his own autoimmune gastritis and assist Tolo with her endometriosis, with the intention of making their findings accessible to others.
Johnson and Tolo have been dating for three years, and their relationship became public in December. Johnson has previously drawn attention for receiving blood plasma transfusions from his teenage son as part of his longevity experiments.