Muscle recovery at night and between meals. 24g Protein - Premium slow-release micellar casein protein. 9 g essential amino acids** – supports endurance and recovery. 2 g sugar. Artificially flavored. 100% protein from micellar casein. Protein powder for drinking. Authentic Optimum Nutrition product. Information – we test – you trust – selections are regularly tested for prohibited substances. Recovery at night. An excellent source of magnesium. Excellent source of zinc. Why Gold Standard 100% Casein? Contains 24 grams of 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 protein. Natural Essential Amino Acids (EAA) to Support Muscle Recovery. Active lifestyle. Sports results. Strength training.