by KATIE COLEMAN

Active people of all kinds consider whey protein a crucial element in their workout recovery. Why? "Whey contains all nine essential amino acids," explains registered dietitian Danette Wickman. "This is important, because amino acids help repair skin and tissue from wounds and surgery. It can also help with weight loss and muscle building." She also recommends it to clients who don't get enough protein in their regular diet.

Whey is one of the two main proteins in milk, and a natural byproduct from the production of dairy items such as cheese. Whey, once it's been pasteurized and dried, has become a popular complete protein supplement known for its multitude of benefits.