Optimum Nutrition Serious Mass 2.73kg - Chocolate Optimum Nutrition Whether you're fueling up post-workout

Whether you're fueling up post-workout or need a quick meal replacement during a busy day

The added BCAAs help promote muscle growth and recovery

incredible shirt-tearing muscle pumps

This product is tailored for athletes and bodybuilders looking to pack on mass quickly and efficiently

Optimum Nutrition Serious Mass 2.73kg - Chocolate Optimum Nutrition Whether you're fueling up post-workoutSerious Mass is a high calorie weight gain supplement with 50g of protein and 1,250 calories per serving. Its designed for individuals looking to pack on mass or increase their caloric intake. Serving Size: 2 scoops (334g) Servings Per Container: 8