Casein protein works by steadily & constantly releasing amino acids into the body for 7 hours. With this constant flow of aminos in the body, the muscles stay fed and nourished and there is no muscle breakdown. Thus, it is recommended to be consumed at night before bedtime as during this time the body is not able to get nutrition and muscles get robbed of the nutrition. Visit : https://www.getfitness.in/product-category/proteins/casein-protein