{"slug": "longevity-guru-bryan-johnson-keeps-girlfriend-s-period-blood-in-freezer-for-2-6m", "title": "Longevity Guru Bryan Johnson Keeps Girlfriend's Period Blood in Freezer for $2.6M Menstrual Health Experiment", "summary": "Bryan Johnson, the tech entrepreneur known for his longevity experiments, revealed on X on 31 July that he is storing his girlfriend Kate Tolo's menstrual blood in a -80°C freezer as part of a $2.6 million (£1.94 million) women's health study. Johnson said the sample, about 10 mL, will be used for non-invasive health analysis, including detecting diseased tissue and measuring exposure to microplastics and chemicals. The project, which involves Tolo collecting 14 million data points with a 12-person medical team and around 50 devices, has sparked online backlash over its invasiveness.", "body_md": "# Longevity Guru Bryan Johnson Keeps Girlfriend's Period Blood in Freezer for $2.6M Menstrual Health Experiment\n\n## Tech mogul Bryan Johnson says he stores girlfriend's menstrual blood and closely monitors her cycle for health study\n\nBryan Johnson has stunned the internet again after revealing he is storing his girlfriend Kate Tolo's [menstrual blood](https://www.ibtimes.co.uk/erling-haaland-memes-menstrual-cycle-education-1811217) in a -80°C freezer as part of a $2.6 million (£1.94 million) women's health experiment.\n\nThe tech entrepreneur and anti-ageing obsessive posted the revelation on X on 31 July, alongside a photo of Tolo.\n\n'Kate's period blood is in my -80 °C freezer. Around 10 mL,' Johnson wrote.\n\nHe said the sample was collected during Tolo's last cycle and is being kept for health analysis, not shock value. Still, the post quickly went viral, with many users saying the project felt invasive and unsettling, even as others argued that menstrual health remains badly under-researched.\n\nJohnson, who became widely known for his intense longevity routine and Netflix documentary 'Don't Die: The Man Who Wants to Live Forever,' has built a public brand around turning his body into a data project. This time, however, the subject is his girlfriend.\n\n## Why Johnson Says Menstrual Blood Matters\n\nJohnson defended the experiment by saying menstrual blood can offer a direct window into the uterus.\n\n'Menstrual blood is valuable and underutilized,' he wrote.\n\nAccording to Johnson, the sample could be used to look for diseased tissue and measure exposure to microplastics, PFAS and endocrine-disrupting chemicals. He said it also contains endometrial cells, immune cells and [stem cells](https://www.ibtimes.co.uk/bryan-johnson-stem-cell-clone-organ-regeneration-1810415).\n\nFor him, the appeal is that the testing is non-invasive. Instead of relying on surgery or standard blood tests, he argued that menstrual blood allows repeated, cycle-by-cycle monitoring of the uterine environment.\n\n'This is great because you get the data without surgical biopsy,' Johnson wrote, adding that it can be measured directly rather than inferred from a regular blood draw.\n\n## Kate Tolo's Day Becomes a Data Project\n\nThe freezer post is part of a much larger project involving Tolo, 30, and Johnson's company Immortals.\n\nJohnson has said Tolo is helping collect 14 million data points linked to her menstrual cycle, calling it a major step for women's health. He said that 'women are not well understood medically' and claimed Tolo would provide one of the most detailed datasets ever gathered on a menstrual cycle.\n\nThe schedule he shared online is extreme. From 6am to nearly 10pm, Tolo's day is packed with blood draws, urine samples, sleep tracking, metabolism tests, body photos, vaginal microbiome swabs, exercise, red light therapy and the use of a so-called 'techno tampon' to monitor blood flow. A 12-person medical team and around 50 devices are involved in the process.\n\nJohnson joked: 'I like that Kate is a science experiment with me.'\n\nTolo replied: 'Thanks for looking after me bby.'\n\n## Online Reaction Turns Uneasy\n\nThat exchange did little to calm the backlash. Some users were less concerned with the science and more uncomfortable with the image of a boyfriend keeping his girlfriend's period blood in a freezer. Others focused on the scale of Tolo's daily routine, arguing that consent does not make the schedule any less bizarre to watch from the outside.\n\nThe reaction fits a familiar pattern for Johnson. His experiments often start as health optimisation and end up as viral debates about money, control, ageing and the limits of self-experimentation.\n\n© Copyright IBTimes 2025. All rights reserved.", "url": "https://wpnews.pro/news/longevity-guru-bryan-johnson-keeps-girlfriend-s-period-blood-in-freezer-for-2-6m", "canonical_source": "https://www.ibtimes.co.uk/bryan-johnson-menstrual-blood-health-experiment-1811770", "published_at": "2026-07-31 13:57:21+00:00", "updated_at": "2026-07-31 14:08:40.590221+00:00", "lang": "en", "topics": ["ai-research"], "entities": ["Bryan Johnson", "Kate Tolo", "Immortals", "Netflix"], "alternates": {"html": "https://wpnews.pro/news/longevity-guru-bryan-johnson-keeps-girlfriend-s-period-blood-in-freezer-for-2-6m", "markdown": "https://wpnews.pro/news/longevity-guru-bryan-johnson-keeps-girlfriend-s-period-blood-in-freezer-for-2-6m.md", "text": "https://wpnews.pro/news/longevity-guru-bryan-johnson-keeps-girlfriend-s-period-blood-in-freezer-for-2-6m.txt", "jsonld": "https://wpnews.pro/news/longevity-guru-bryan-johnson-keeps-girlfriend-s-period-blood-in-freezer-for-2-6m.jsonld"}}