Archive · 31 Jul 2026
Bryan Johnson Freezes Girlfriend's Menstrual Blood for Research
Bryan Johnson, a 48‑year‑old entrepreneur, put 10 milliliters of his girlfriend Kate Tolo’s menstrual blood into a freezer that keeps it at -80 degrees Celsius.
He says the blood contains useful cells that can help scientists learn about the uterus without surgery.
Johnson wants to use this data to treat his own autoimmune disease and Kate’s endometriosis, and then share the results with others.
He has also talked about cloning himself to test new therapies.
The experiment is part of his larger goal to use technology to cure diseases.
Bryan Johnson stored 10 mL of Kate Tolo’s menstrual blood at -80°C for research.
The sample contains endometrial, immune, and stem cells useful for disease studies.
Johnson claims menstrual blood can reveal uterine health without invasive biopsy and can be sampled each cycle.
He aims to use AI and biotech to treat his autoimmune gastritis and Kate’s endometriosis, then share the results.
The experiment follows his earlier claim of cloning himself as a newborn in a Petri dish for testing therapies.
- Who
- Bryan Johnson and his girlfriend Kate Tolo
- What
- Freezing 10 mL of Kate Tolo's menstrual blood for research
- When
- Recently
- Where
- In Johnson's personal freezer
- Why
- To study uterine health and develop treatments for their conditions
- Researcher
- Bryan Johnson
- Subject
- Kate Tolo
- Sample volume
- 10 mL
- Freezer temperature
- -80°C
- Purpose
- Study uterine health and develop treatments
- Conditions
- Autoimmune gastritis, endometriosis