|This article is about a/an Precious in GoGo Sentai Boukenger.|
- Hazard Level: 121
The Philosopher's Herb (賢者のハーブ Kenja no Hābu) is a mystical alchemic plant that the Questers manipulate Ryuuwon and the Jaryuu to retrieve within the heart of the volcanic Mt. Genbu. They use it to form the Homunculus' blood in the Mercurius Vessel.