Witcher 2 Beste Mutagene. The madness mutagen is the best one, providing bonuses to armor, health, and damage. Here’s what we know from the books on the mutagens.

E.) early on, then got both levels of impregnation later, it remains at +2%; Each of these has a mutagen slot to provide special bonuses to the abilities in that group. There are several tiers for mutagens, it's been a few months since i've played it, but i don't think 2% is particularly good.