What is Muscle Milk?

Cytosport, the manufacturer of Muscle Milk, describes it as a high-protein nutritional supplement and meal replacement product. The main ingredients are calcium sodium caseinate, milk protein isolate, whey protein isolate and whey protein isolate. Additional protein sources include lactoferrin, l-glutamine and taurine.

Muscle Milk is available as a powder and as a ready-to-drink liquid, according to the product website. Both powdered and liquid forms are available in several flavors, such as banana, chocolate and mocha, as well as in low-calorie, all-natural and weight-gaining formulations. Despite being milk protein-based, most products are free of lactose. All are fortified with vitamins and minerals to enhance their nutritional value.