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Your average witcher also understands the basic principles of alchemy. His knowledge of these principles lets him blend herbs and other alchemical substances into potions and oils that can have profound effects on his body and equipment. In The Witcher 2, this means that you can use alchemy to create temporary boosts to your stats. Each boost works in a slightly different way.

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In most games, but particularly games, potions are items you can quaff to instantly restore lost HP, mana, or other resources. In The Witcher 2, you drink potions to fundamentally alter Geralt’s body chemistry for a short period of time. Potions can increase Geralt’s vitality and vigor regeneration, increase his resistances to critical effects, make his signs more powerful, and cause other effects.