|“||You'll know, believe me. Nine essential vitamins, minerals, amino acids...oh, everything you need to feel yourself again.||”|
Hermes' Multivitamins is a bottle of magic multivitamins that the god Hermes gave to Percy Jackson in The Sea of Monsters. Each flavor is from a different color and type, like Minotaur, Hydra, and other monsters.
Annabeth Chase takes a lemon Minotaur vitamin after she finds out that Circe had turned Percy into a guinea pig. Once Circe returns and sees that Annabeth is trying to free Percy and the other rodents, she attempts to stop her with magic. Circe's magic has no effect on Annabeth, with much credit towards the vitamins.
After becoming immune to Circe's magic, Annabeth goes over to the guinea pig cage where Percy and several other guinea pigs are being kept. She dumps all the vitamins in, and Percy and the other guinea pigs in the cage eat the vitamins in order to reverse their fate after being turned into guinea pigs by Circe. Circe gets infuriated, and runs away, because they are immune to her magic and they are very mad at her for turning them into rodents.