Manuscript page: Enhanced Petri's Philter is an alchemy formula in The Witcher 3: Wild Hunt that is needed to craft Enhanced Petri's Philter.
It's a possible spawn at a random diagram location starting at level 12, or purchased from the following merchants:
- Herbalist in a shop in Glory Lane
- Herbalist in the Druids' Camp
- Herbalist at the Ruined Inn
- All alchemists in Toussaint
