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Whey is a product of cheese making -- it’s the watery part of milk that separates from the curds. Some people use whey as a source of protein or as a supplement for health conditions.

Why do people take whey protein?

Protein powders are popular with athletes, particularly those doing strength training. They provide a good source of nutrients and amino acids. Some people take whey protein because they are lactose intolerant or allergic to other protein sources, like eggs or soy.

Several studies have found that whey protein, when combined with strength training, might increase strength, muscle size, and lean body mass.

A few studies of whey protein as a treatment have been promising. It's been found to help prevent excessive weight loss in people with HIV.

Early evidence suggests that whey protein might also help prevent milk allergies in formula-fed infants. When compared to cow’s milk protein, whey may help prevent the development of atopic dermatitis or eczema in young children. More research is needed. Talk to your child's health care provider before giving your baby whey protein.

Whey protein has also been studied as a way to slow down metastatic cancer. More research needs to be done.

How much whey protein should you take?

Optimal doses of whey protein have not been established for any condition. Quality and active ingredients in supplements may vary widely from maker to maker. This makes it very hard to establish a standard dose.

Can you get whey protein naturally from foods?

Whey protein is found in milk in small amounts. In the process of turning milk into cheese, whey protein is removed.

What are the risks of taking whey protein?

Given the lack of evidence about its long-term safety, women who are pregnant or breastfeeding should not take whey protein unless a doctor recommends it.

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