Potion Resistance for helmets

I was thinking it would be cool to have an enchantment that protected you from potion effects. The higher the level the more likely it is to negate the effects, however this works for both good and bad effects.

The amount negated should be around 5% per level to a max of 15% or level 3 or whatever seems balanced.

this amount is how likely a potion effect just doesn't happen on the player at all still allowing lingering potions to be a counter play to this.