Optimum Nutrition Serious Mass: the ultimate in weight gain formulas. Serious Mass supplies you with the tools you need to pack on the pounds during a bulking phase and develop the physique you've always wanted.
High-potent weight gainer
Great for bulking season
1250 calories per serve
50g of Protein
254g of Carbohydrates
Complete meal replacement with 25 vitamins & minerals
Enhanced with Creatine, Glutamine, and Glutamine Peptides