Optimum Nutrition Serious Mass is designed to support muscle building and weight gain while fueling intense workouts. Each serving provides up to 1260 calories, 50g of protein from fast-digesting whey protein concentrate, 250-253g of carbohydrates, and 5g of creatine monohydrate. This high-calorie protein powder is ideal for athletes with ambitious muscle and performance goals, offering essential energy and macronutrients for a bulking diet. It also delivers 19 vitamins and minerals and 8g of naturally occurring glutamine per serving. With its rich, great-tasting vanilla flavor, Serious Mass makes a delicious and convenient addition to any performance-focused lifestyle, trusted by elite strength athletes worldwide.