What does Hermes give Odysseus to protect him for Circe?

Hermes gives Odysseus a magical herb called "moly" to protect him from Circe's witchcraft. Moly has a black root and a white blossom, and it is said to be incredibly potent against enchantments and magic. This gift enables Odysseus to resist Circe's spells and ultimately confront her effectively. With Hermes' aid, Odysseus is able to protect his crew and navigate the dangerous situation with Circe.