I was just reading this Smithsonian article about a book titled Mummies, Cannibals and Vampires: The History of Corpse Medicine from the Renaissance to the Victorians.
According to it, not only did Romans drank the blood of slain gladiators to get their life’s vitality, but “for several hundred years, peaking in the 16th and 17th centuries, many Europeans, including royalty, priests and scientists, routinely ingested remedies containing human bones, blood and fat as medicine for everything from headaches to epilepsy.”
Blech. My favorite bloody detail:
A 1679 recipe from a Franciscan apothecary describes how to make [human blood] into marmalade.
"Lovely strawberry jam, Martha."
"Oh, that's my special marmalade recipe!"