Optimum Nutrition Serious Mass is a high-calorie protein powder supplement designed for muscle building and weight gain. This vanilla-flavored formula provides 1,250 calories and 50g of protein per serving, making it ideal for athletes and individuals looking to increase their mass. Key features: • 1,250 calories per serving • 50g protein per serving • 253g carbohydrates per serving • Vanilla flavor • 6 lb (2.72 kg) container • 8 full servings per container • Supports muscle building and weight gain goals Serious Mass is a comprehensive weight gain formula that combines high-quality proteins, complex carbohydrates, and essential nutrients. The powder can be mixed with water or milk for a thick, creamy shake. The large 6 lb container provides 8 complete servings, making it an efficient solution for those struggling to meet their caloric needs through regular food intake alone. The vanilla flavor offers a versatile taste that can be easily combined with other ingredients.