Bloodreplacing?
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Bloodletting is actually still used to treat some diseases - for example it is the primary way to treat Haemochromatosis. Until recently, in the UK at least, people with this condition couldn’t donate blood, so it was just thrown away like back then too - though more recently they started allowing donations to help treat hospitalised anaemia.
Yup, I’m on testosterone and have to have “therapeutic phlebotomy” every so often. That’s just a fancy name for bloodletting
Also if you count blood donations, it’s currently the only known way to reduce forever chemicals in your blood.
They actually still do bloodletting, and even use leeches to do it.