What did Hermes give to Odysseus to protect him from circes magic?

Hermes gave Odysseus a magical herb called "moly" to protect him from Circe's magic. This herb had black roots and a white blossom, and it was said to be extremely potent against enchantments and sorcery. With this protection, Odysseus was able to withstand Circe's spells that turned men into animals, allowing him to resist her powers and ultimately negotiate his crew's release.