Serious Mass by Optimum Nutrition is designed for those looking to seriously increase weight and muscle mass. With over 1250 calories per serving when mixed with water, it combines gradually digestible carbohydrates and high biological value proteins. Additionally, it includes creatine and glutamine to enhance recovery and muscle development. This supplement is ideal for individuals with a fast metabolism and athletes needing a substantial caloric intake. It is also enriched with 25 vitamins and minerals to optimize performance. Serious Mass guarantees quality and potency in a manageable format.