When most athletes think of protein, the first that comes to mind is usually whey protein. Protein is what muscle is made of, so it is a very useful and even necessary part of a body builder's diet. Protein blends combine various sources of protein like whey concentrate, isolate, casein and other to form a high-quality cocktail of muscle-building fuel. Blends provide fast-absorbing protein for growth, plus other proteins that provide longer digestion times for around-the-clock support. Some blends also include small amount of carbohydrates for maximum performance and recovery. Protein blends are extremely versatile and can generally be taken any time of the day. They're the perfect choice for anyone looking to get more out of their workouts and more out of their muscles.