I always heard it was some sort of a shit elixir made from the faeces of those long-lived bulgarians.
One source:
“Hitler’s chronic flatulence may have accounted for his becoming a vegetarian and to his allowing a quack doctor named Theodore Morrell to dose him with as many 28 different medicines, including one made of extract of Bulgarian peasants’ faeces.”
If someone can find the name of the actual preparation / drug it would be kind of interesting.
