Protein is an essential macronutrient that helps build muscle, repair tissue, and make enzymes and hormones. Using protein powder may also aid weight loss and help people tone their muscles. There are many different types of protein powder, including dairy-based and plant-based powders.it can help you increase strength, gain muscle and lose significant amounts of body fat ( 2 ). However, whey is more than just protein. It contains many other nutrients, some with potent biological effects. In fact, it's one of the best-studied supplements in the world.Protein supplements are designed to promote increased muscle mass when combined with regular exercise. ... Put simply, they work together to provide your body with the necessary foundation to create the amino acids that are needed to build muscle tissue, quicker and more efficiently.