This item is not needed to craft any item.
- Skellige: Sold by Gremist in Skellige
- Velen: A copy of the manuscript is inside the cave with two refugees in the Contract: Phantom of the Trade Route quest.
- Ard Skellig: A copy of the manuscript is in a barrel within a cove southwest of the Grotto.
- Freya's Garden: Within the chest in the cave beneath Morkvarg's lair.
Trivia or Notes about Superior Petri's Philter