Butter doesn't lower HDL...In fact, Saturated Fats tend to raise HDL. HDL is mostly lowered by either Omega-6 Polyunsaturates [Vegetable Oils] and Trans-Fats [Margarine, Crisco, Shortening, and Hydrogenated Oils.] Fruit Oils [Olive, Coconut, etc...] and Animal Fats [Butter, Lard, Tallow, etc...] tend to either not effect or raise HDL.