Celebrity3 min(s) read
Bizarre reason why biohacker Bryan Johnson keeps his girlfriend's menstrual blood in his freezer
Biohacker Bryan Johnson has revealed why he freezes his girlfriend's menstrual blood in his quest to defeat dying.
Johnson, 48, has made it his mission to try and live forever by carefully monitoring all of his biometrics to try and get ahead of any diseases that could cost his life.
As part of his quest, he has also enlisted his girlfriend, Kate Tolo, 30, as he attempts to better understand female health - especially to do with fertility and menstruation - by gathering billions of pieces of data on her body, too.
Johnson revealed on X (formerly Twitter): "Kate’s period blood is in my -80 °C freezer. Around 10 mL."
He added that the blood is "valuable and underutilized", explaining: "It’s a non-invasive look into the uterus. She collected the blood during her last cycle."
He revealed that the sample will be used to look for signs of diseased tissue, as well as things that shouldn't be there, such as microplastics, endocrine disruptors, and "forever chemicals" known as PFAs, which can accumulate in the body over time.
Johnson added: "This is great because you get the data without surgical biopsy, it can be repeated every single cycle, and it measures the uterine environment directly instead of inferring it from a standard blood draw."
Tolo is currently taking part in a 100-day project to collect 14 million data points on her menstrual cycle, with every moment of her day mapped out by scientific tests, including her saliva being collected and her cheeks being swabbed, as well as using a high-tech tampon to track other health metrics.
The project, which is costing $2.6million, aims to explore gaps in medical research around female reproductive health, a part of medicine which appears to have fallen behind.
Tolo told the Wall Street Journal in July: "I’m really doing it because I think that this is our path toward women being understood in the world and being seen."
She was previously diagnosed with endometriosis, a painful condition in which tissue grows outside the uterus, causing chronic pain, inflammation and scarring, and often needing surgery to offer relief.
Johnson wrote on X in May alongside a photo of him watching Tolo's ultrasound during a gynecological exam: "This affects at least 1 in 10 women, likely more.
"Typically women live with endometriosis for 7-10 years before being diagnosed."
Tolo was diagnosed after spending years suffering from severe pain during her periods, and also has polyendocrine metabolic ovarian syndrome, previously known as polycystic ovary syndrome, or PCOS.
Johnson has also discovered some health conditions of his own through his research, and revealed he was diagnosed with autoimmune gastritis.
He explained: "My sincere goal is to try and heal the sick. With AI and biotech, we no longer have to concede to disease. We don’t need to wait for big, billion-dollar companies to do it for us.
"I’ll cure my AIG and we will cure Kate’s endo, and then make the same available to others."
Johnson and Tolo have been open about their own health metrics, with the biohacker declaring in May that his girlfriend - who he has been with for three years - had the "top 1% of all vaginas," following results from her Tiny Health vaginal health test.
"Her sample is dominated by the single most protective bacterial species a vagina can host (Lactobacillus crispatus)," he told his followers.
"Only about 25-30% of reproductive-age women globally are L. crispatus-dominant, and dominant usually means above 50%. Kate is at 98.7%."













