Optimum Nutrition Pro Complex is a protein powder that combines eight protein sources including whey protein isolates, egg albumen, and hydrolyzed proteins to create a superior blend designed to enhance muscle building. Each serving contains 60 grams of high quality protein and is enhanced with 14 grams of BCAAs, 10 grams of glutamine, and digestive enzymes and vitamins and minerals to support gains. The varied digestion rates and amino acid profile of the blend make it formulated to take muscle building to the next level.