In Greek mythology, Hermes gave Odysseus the magical herb moly to protect him from Circe’s magic.
The episode appears in Homer’s Odyssey. Circe transforms several of Odysseus’ companions into swine, and Hermes meets Odysseus on the way to the sorceress’s house. He gives the hero moly, describing it as a difficult plant for mortals to pull from the ground. Its black root and milk-white flower make it recognizable in the poem.
When Circe uses her potion and wand against Odysseus, the herb prevents the spell from working. Odysseus can therefore threaten her and force her to restore his companions. Hermes’ intervention emphasizes his role as a helpful guide and protector of travelers.
Moly is not the same as the laurel sacred to Apollo, nor is it ordinary food of the gods such as ambrosia. Its exact botanical identity remains debated.