Optimum Nutrition Serious Mass Weight Gain Powder, 5.44 kg – Chocolate Peanut Butter

• Add serious mass with 1,250 quality calories per shake
• Each serving contains 50 g of proteins to support muscle growth and 252 g of carbs
• Enjoy between meals, post-workout or before bed

Serious Mass is the ultimate in weight gain formulas. Serious Mass supplies you with the tools you need to pack on the pounds and develop the physique you’ve always wanted.