Serious Mass by Optimum Nutrition is a gainer product designed for weight gain through significant caloric intake. Each serving of 340 g, made up of 2 scoops, provides 1260 calories, 50 g of protein, and 251 g of rapidly absorbed carbohydrates. The protein blend includes whey protein concentrate, calcium caseinate, and egg white, ensuring a wide range of essential amino acids, with an additional 24 g present. The product is also supplemented with 5 g of creatine monohydrate, which enhances physical performance in high-intensity exercises, provided that at least 3 g is consumed daily. Its formula also includes 8 g of glutamine and a broad complex of 25 vitamins and minerals for complete nutritional support. Designed for individuals with high physical activity and those who have difficulty gaining weight due to a fast metabolism. Available in various flavors like chocolate and vanilla.