ingredients: include rat tails
Exact effect unknown
Reveals the worst faults and habits of the target person to the drinker
c.f. Love Potion
Exact effect unknown, but presumably causes hiccups
Used in boil-cure potion (see).
Some Dark Magic requires human flesh or bones. In Knockturn Alley, one can buy human fingernails (CS4) and human bones (Pm, CS4). Polyjuice Potion requires a hair of the person one wants to "turn into." More gruesome is the potion created by Voldemort to regain his body (GF32).