CEO stores girlfriend's period blood for longevity research

Bryan Johnson, founder and CEO of Project Blueprint, keeps 10 ml of his girlfriend Kate Tolo's menstrual blood in a -80°C freezer for longevity research.

Johnson believes menstrual blood provides health information not available from standard blood tests, as it comes directly from the uterus and can reveal uterine cells, immune cells, stem cells, and contaminants like microplastics, PFAS, and endocrine-disrupting chemicals.

He calls menstrual blood 'valuable and underutilized' and a non-invasive way to examine the uterus without surgical biopsy, repeatable every cycle.

Johnson, who founded Braintree (acquired by PayPal in 2013 for $800 million), is known for his Blueprint project focusing on slowing aging through diet, exercise, sleep, and medical testing.

The post comes a day after Johnson publicly questioned whether he had 'taken this whole longevity thing too far.'