Milk protein is basically a natural ingredient that is derived from cow's milk. This product contains casein and whey protein, which are excellent for giving a feeling of deep nourishment and hydration. Milk protein is a common ingredient in cosmetics and hair care products, as it helps skin and hair not only to look great but also to feel healthy and in good condition.Both formulators and DIY formulators choose high protein milk because of its good water solubility, smooth skin feeling, and compatibility with humectants (like glycerin and hyaluronic acid) and shine enhancers (like light esters and silicones).