Whey protein is the highest BV (Biological Value) protein available. Research has shown that the highest rate of nitrogen retention is achieved with whey protein.USN’s 100% Premium Whey provides the purest form of this single protein substrate. Whey contains proteins such as lactalbumen and immunoglobulins. Now with revolutionary MyoMatrix whey protein isolate and concentrate blend and Tolerase L digestive enzyme technology, which is a pH-stable lactase. Lactase enzyme improves lactose digestion in individuals who have difficulty digesting lactose.