Muscle recovery at night and between meals. 24 g protein - slow-digesting micellar casein protein. 9 g essential amino acids** - supports endurance and recovery. 1 g sugar. Artificial flavor. 100% protein from micellar casein. Protein Powder Drink Mix. Authentic Optimum Nutrition product. Informed Choice - We Test Your Trust. Regularly tested for the presence of prohibited substances. Recovery at night. An excellent source of magnesium. An excellent source of zinc. Why Gold Standard 100% Casein? 24 grams per container Premium slow-release micellar casein protein to support muscle recovery. Slowly digestible protein can be used to support muscle recovery when you are left without food, for example during sleep or between meals. 9 grams of naturally occurring essential amino acids (EAA) to support muscle recovery. Active lifestyle. Sports results. Strength training. Optimum Nutrition has been trusted for over 30 years and is trusted in over 90 countries. which provides the highest quality of recovery after training pre-workout energy and on-the-go sports nutrition.