Nature's velvet whey protein isolate is a high quality protein source derived from milk and is the co-product in the manufacture of cheese. Whey protein is a collective term that describes the cow's milk proteins that are soluble in the low ph environment created when making cheese. Whey protein isolates are defined as having >90% protein on a dry weight basis. 100% whey protein isolate is an all natural unflavored whey protein isolate with no artificial sweeteners fillers or bulking agents. Rich in the amino acid leucine proven to be the building block needed for your lean muscle tissue. It is one of the highest quality proteins available.