Trans HRT is not merely 100+ years old, it's *thousands* of years old. Western medicine would have you believe otherwise, but it's a lie, and I hate to see it repeated so frequently.
Transfems specifically have been using the same ingredients cis women were using for HRT for most of the 20th century, but transfems have been using those ingredients for, again, *thousands* of years. Pregnant.Mare.Urine... Pre.Mar.In... Premarin.