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Whey protein is one of the two primary proteins found in milk, the other being casein. When cheese is made, the whey separates from the curd and is collected, filtered and dried to make whey protein powder. Whey protein concentrate contains anywhere from 29 to 89 percent protein and also typically has low levels of fat and lactose. Whey protein isolate contains at least 90 percent protein and undergoes additional processing. Most of the people are confused to buy whey protein or isolate.Whey is one of the two primary prot... more