|Critical effects mutagen|
|Type||Alchemy ingredient / Mutagen|
|Source||Loot / men east of the dwarven smithy in Flotsam|
|Price to buy||231 – 289|
|Price to sell||13|
Geralt receives this mutagen if he agrees to participate in an experiment being conducted by two randomly named men, hanging around just east of the dwarven smithy in Flotsam.