India, July 31 -- Bryan Johnson has revealed that he keeps his girlfriend's period blood in the freezer as part of his longevity and health research. The tech entrepreneur, who is best known for spending millions of dollars every year in his quest to slow down aging, revealed the startling fact in an X post this morning.

"Kate's period blood is in my -80 degC freezer," he wrote, with Kate referring to his girlfriend Kate Tolo - a 30-year-old Australian-Bosnian biohacker.

The California-based founder and CEO of Project Blueprint added that he keeps around 10 ml of his girlfriend's period blood in his freezer. This post comes just a day after he publicly wondered whether he had "taken this whole longevity thing too far".

In a follow-up p...