Protein is a vital component of muscle growth and preservation. It provides the body with all of the necessary amino acids and nutrients, while also increasing energy levels and vitality. Wholesale whey protein isolate is available in many different types for various dietary needs and retail purposes. Whey protein may boost muscle growth, for example, while casein protein supports lean muscle mass maintenance. This makes whey protein powder and casein the go-to proteins for the supplement and sports nutrition industries.