- "Eels' Eyes can be used in all sorts of potions."
According to a painting at St Mungo's, one must stand naked in a barrel of eel's eyes at the full moon with a frog's liver tied tightly about one's throat to cure Spattergroit; the legitimacy of this claim remains somewhat unconfirmed.
- Harry Potter and the Philosopher's Stone (First appearance)
- Harry Potter and the Order of the Phoenix (Mentioned only)
- Harry Potter Trading Card Game