Hermes' Multivitamins

Hermes' multivitamins is a bottle of multivitamins that Hermes gives to Percy Jackson. Each flavour is from a different color and type, like Minotaur, Hydra or other monsters.

History
In ancient times, Hermes' multivitamins was really a magic herb which was called Moly. Hermes gave Odysseus the magic herb on Circe's island to protect him from the witch's power.

The Sea of 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.

The other guinea pigs turn out to be Blackbeard (also known as Edward Teach) and his crew.

There are different flavors and come in different shapes like lemon Minotaurs, grape Furies (or possibly grape Harpies), and so on. Each multivitamin is supposed to have a slightly different effect.