Muscle Milk Pro Advanced Nutrition Protein Shake, Knockout Chocolate, 14 Fl Oz Bottle- Muscle Milk Pro Advanced Nutrition is an energizing protein shake that can be consumed to support post-workout recovery and muscle growth or as an on-the-go breakfast or anytime snack. It contains a combination of slow releasing and fast releasing proteins to help increase amino acid levels. These essential amino acids play a role in muscle growth. Also try adding your protein shake to coffee, smoothies or even oatmeal when you’re looking for a protein boost.