Optimum Nutrition (ON) Serious Mass Weight Gainer – High Protein, High Calorie Muscle & Weight Gain Powder

Optimum Nutrition (ON) Serious Mass is a high-calorie weight gainer designed to help you build muscle mass, increase strength, and achieve healthy weight gain. This powerful formula combines high-quality protein with a dense blend of carbohydrates to deliver the calories needed for effective bulking.

Ideal for hard gainers and athletes with high energy demands, Serious Mass supports muscle recovery, enhances workout performance, and helps you reach your calorie goals with ease. It can be used post-workout or between meals to maintain a consistent calorie surplus.

With added vitamins and minerals, this advanced gainer also supports overall health and performance while helping you build size and strength.

Key Benefits:

• High-calorie formula for rapid weight gain
• Rich in protein to support muscle growth and recovery
• Provides sustained energy with quality carbohydrates
• Supports strength, endurance, and performance
• Ideal for bulking, athletes, and hard gainers