Folklore's take on vampire potions is fascinatingly diverse, honestly. In Eastern European tales, these brews often involve grave dirt, blood (sometimes the maker's own), and herbs like wolfsbane—ingredients meant to mimic or repel undead qualities. I read a Moldavian legend where a witch created a 'life-stealing elixir' by fermenting bat wings in moonlight, which supposedly granted temporary vampiric strength to drinkers.
What intrigues me is how these recipes blur lines between poison and power. Some potions were defensive, like garlic-infused oils rubbed on doors, while others, like the infamous 'Black Brew' from Serbian lore, allegedly turned users into night creatures for three days. The symbolism’s thick here: transformation, taboo, and that eternal human itch to flirt with darkness.