Final answer:
Whey protein isolate contains at least 90% protein by weight, offering a high concentration of essential amino acids beneficial for muscle recovery, especially in athletes and bodybuilders.
Step-by-step explanation:
Whey protein isolate is a high-quality source of protein that is derived from the process of making cheese from milk. It contains high levels of essential amino acids and branched-chain amino acids, which are valuable for muscle recovery, particularly for bodybuilders. When comparing the different types of whey protein, whey protein isolate contains at least 90% protein by weight, making it one of the purest forms of protein available. This is in contrast to whey concentrate, which contains 29-89% protein by weight. Whey hydrolysate, on the other hand, is predigested and absorbs the fastest of all the types.