Whey protein is a popular nutritional supplement used by athletes to support muscle recovery and gain. Whey is a derivative of milk and is produced during the cheese-making process. The two primary forms of whey protein found in products are whey protein concentrate and whey protein isolate.
Definitions
Whey protein isolate is a more concentrated form of whey protein than whey protein concentrate. Whey protein isolate contains at least 90 percent protein, as the fat and lactose in the product have been filtered out. Whey protein concentrate contains 29 to 89 percent protein and greater amounts of both fat and lactose.
Biological value
Both forms of whey protein provide high-quality protein and a rich source of amino acids to recovering muscles. Whey protein has a high biological value compared to beef or eggs which means it can be digested and absorbed quickly by the body for growth and repair. The biological value of the isolate form is 30 to 60 percent higher than the concentrate form.
Cost
The price difference between whey protein isolate and concentrate is a result of the extra manufacturing steps taken to filter the isolate product into its pure form. For consumers who have the money to spend and who do not want the added fat and calories of the whey protein concentrate, the isolate product is a good bet. Whey protein concentrate, still containing the same beneficial amino acids and other whey benefits, has a much lower cost per serving but contains a few more calories.
Using Whey Protein Products
Athletes require between 1.2 and 1.7 g protein/kg body weight per day. Some of this can safely come from whey protein. Appropriate use of whey protein concentrate or isolate consists of one scoop containing 20 to 25 g of protein mixed into a drink and consumed within an hour of exercise. Taking whey protein before or after exercise is appropriate.
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