Bryan Johnson Says Menstrual Blood Is an Understudied ResourceAccording to Johnson, approximately 10 millilitres of menstrual blood have been preserved in an ultra-low-temperature freezer for future analysis. Johnson argued that menstrual blood offers researchers a non-invasive way to study the uterus and suggested the field remains significantly underexplored compared with other areas of medicine. The entrepreneur also wrote that he enjoys conducting scientific experiments alongside Tolo, adding that she has actively participated in the project. Women's Health Research Has Historically Been UnderrepresentedJohnson has argued that his project highlights broader gaps in medical research. Researchers have also noted that menstrual health remains comparatively understudied despite its importance to reproductive medicine.