Ferassin root
From The Stargate Omnipedia
Native plant which grows in the 100-square-mile wilderness on Zaddik's planet. It was this root that Zaddik himself used to create a serum which he believed would quench Ellia's Wraith hunger. Eventually he learned that it never had any effect at all.
KEY EPISODE
Instinct - Zaddik keeps samples of the Ferassin root in his laberatory as Ellia grounds it up to make more of her serum.