Potion of Restoration is a special potion introduced in the Blood and Wine expansion. It allows the player to redistribute their ability points that were used for mutations but it does not return the mutagens used, so you'll have to re-gather them to unlock any abilities.
The following merchants may sell it:
- Merchant in the Perfumery
- Herbalist at Castel Ravello
- herbalist at Coronata Vineyard (after being rescued)
- herbalist just east of Lazare Lafargue in Hauteville
- This potion can be bought from certain merchants so its exact number of times available is unknown