Whey protein is a high-quality protein derived from cow's milk. Whey contains amino acids and proteins believed to have antioxidant, antibacterial, and antiviral properties. Whey plays an important role in digestion in several ways, for example, some proteins in whey bind to vitamins and minerals so that these nutrients are metabolized properly. Whey is believed to enhance digestion, gut function, and immune function.

Whey is the watery part of milk that remains liquid when the rest forms curds. It is naturally sweet in flavor and amazingly creamy when whipped, and generally fat free while being low in calories. Whey protein is often used by athletes and others trying to build muscle tissue.