Mass Building

Optimum Nutrition Serious Mass is the ultimate weight gainer for those who struggle to gain size or need extra calories to fuel intense training.

• High Calorie: Packed with the calories you need to support muscle growth.
• Protein-Rich: High-quality protein blend for effective muscle repair.
• Essential Nutrients: Fortified with vitamins and minerals for balanced nutrition.
• Mass Building: Designed for hardgainers looking to build significant size.