Protein is an important building block of bones, muscles, cartilage and skin. In fact, your hair and nails are comprised mostly of protein. Your body uses it to build and repair tissue. Speeding recovery after exercise and/or injury. Reducing muscle lossBuilding lean muscle. Helping maintain a healthy weight. Curbing hunger Whey is an excellent source of high quality protein. Whey protein promotes muscle growth. Whey protein may lower blood pressure. Whey protein may help treat type 2 diabetes. Whey protein may help reduce inflammation.