Whey protein can help improve your body composition, but it can also benefit you in other ways. According to a 2004 report published in the "Journal of Sports Science and Medicine,” whey protein contains antioxidant properties that help to boost your immune system. It contains a high level of the amino acid cysteine, which helps to boost levels of glutathione. Glutathione supports your immune system by combating bacteria and viruses. Whey also contains more leucine, a BCAA, compared with soy, milk and egg protein. Leucine promotes fat loss, according to McKinley Health Center.
Whey protein may benefit you, but only in moderation. It’s important to know that consuming too much whey protein can lead to increases in body fat, and it puts an extra strain on your kidneys. For general improvements in body composition, immune system function and fat loss, McKinley Health Center suggests you consume 20 grams to 25 grams of whey protein per day. You may need less than these amounts, so check with your doctor before supplementing whey protein.