Ambrosia

Ambrosia is a mythological food known in Greek legends to give its drinker immortality. In truth, it was used as food for angelic beings, such as Cupids. However, it was also a poison to mortals.

Dafydd used a small portion of ambrosia to poison the patrons at Halliwell's, though Paige Matthews was able to heal them before the condition became too severe.