Serious Mass by Optimum Nutrition is the perfect supplement for those seeking significant increases in muscle mass and weight. Designed specifically for people with fast metabolisms or athletes with high energy demands, this product offers over 1250 calories per serving, combining complex carbohydrates and high-quality proteins like whey protein concentrate, calcium caseinate, and egg albumin. This blend ensures a continuous release of essential amino acids for muscle recovery. Additionally, it includes creatine monohydrate, glutamine, vitamins, and minerals to enhance strength, recovery, and overall well-being. Ideal for consumption between meals or before bed, ensuring a constant anabolic state.