Serious Mass ON

Optimum Nutrition Serious Mass

High-calorie weight gainer formulated to support muscle size and weight gain goals. Delivers 1,250 calories, 50g of protein, over 250g of carbohydrates, plus added creatine monohydrate, glutamine, and a blend of essential vitamins and minerals to support recovery, strength, and overall performance. Ideal for hard gainers and individuals looking to increase calorie intake efficiently.