ON (Optimum Nutrition) Serious Mass

OPTIMUM NUTRITION SERIOUS MASS – EXTREME CALORIES. SERIOUS SIZE.

Optimum Nutrition Serious Mass is a high-calorie mass gainer built for individuals with aggressive weight-gain and muscle-building goals. Each 2-scoop serving delivers 1,200+ calories and 50 g of high-quality protein, making it an ideal shake for post-workout recovery or between meals when calorie demands are at their highest. This formula is designed to help you size up efficiently when regular meals alone are not enough.

Serious Mass is not a low-calorie formula and not a basic protein supplement—it is engineered specifically to support high-calorie, high-protein diets. Every serving includes 256 g of carbohydrates to fuel intense training, along with 3 g creatine and 1 g glutamine to support strength, recovery, and performance. Added 24 essential vitamins and minerals help support overall nutrition during heavy bulking phases.

Banned-substance tested and suitable for vegetarians, Serious Mass is trusted by athletes who are serious about gaining weight, muscle mass, and strength. Clean, calorie-dense, and performance-driven, this is mass nutrition designed for those who refuse slow progress and demand visible results.