Formulated From Science. Superior Whey/Casein Blend. Ultra-Pure Milk Protein Isolate. 5 Grams BCAAs. LEU PepForm - Leucine Peptides. 27 Ultra Pure Servings. 23 g Premium Protein. 1 g Total Fat. Gluten Free. Natural & Artificially Flavored. Do You Just Whey? If you’re a regular whey protein user, there’s something you need to know. When it comes to optimally building lean muscle, 100% whey protein is NOT ENOUGH. Nature had it right. When researchers tested a combination of whey protein + casein protein, as found naturally in milk protein, they discovered that the two protein sources work together in a synergistic manner to build lean muscle. 100% whey protein in isolation only gets you so far…it can spike protein synthesis with an influx of amino acids, but quickly returns to baseline, leaving you where you started. It is important to consume both whey and casein protein together. In another published study, researchers found the combination of whey protein with casein protein resulted in a quick increase in protein synthesis along with a sustained elevation in plasma leucine levels. Plasma leucine levels are a key dictator of muscle protein synthesis, and thus, a combination of whey protein and casein protein may serve to maximize muscle protein accumulation. This is the exact, real, validated science SELECT PROTEIN is formulated from…a combination of the highest quality Milk Protein Isolate and Whey Protein Concentrate 80%.