[quote=Jerkchicken]
So vancian magic?Also I meant supermen in the generic sense. Since the witchers it seems are basically your generic supersoldier but with herbs and magic instead of some sort of science serum.
[/quote]

Not exactly. They're not even considered human, as the mutation completely rewrites their genetic code. Witcher is its own race, separate from humanity. They're not as numerous as other races (they number in the thousands), but they are considered their own race nonetheless.