Whey protein is generally the most common protein found in the body building community, and is recognized as one of the best and most complete proteins around. The importance of an effective protein supplement has been recognized for a long time, not only for athletes, but for those who don’t get enough protein in their diet – particularly vegetarians. Whey protein isolate is purer and has a higher biological value than whey protein concentrate. It also generally has less fat and lactose. Whey protein isolate has been demonstrated to be more efficiently absorbed into the muscles, and may even contain properties that boost the immune system.