The Forbidden Capsule is a support item found only in Atelier Ayesha: The Alchemist of Dusk. In Atelier Ayesha, The Forbidden Capsule is a support item that Ayesha can create at Alchemy LV. 34 once she obtains the recipe book, "Synthesis Origins" from a treasure chest in Yggdrasil-Flower Alley near the end of the story. The reason for this powerful support item being considered dangerous to use in the past was because the drug was a double-edged sword due to the "Side Effect L,M,S" properties it had, giving it the name "Forbidden Capsule".