Optimum Nutrition Serious Mass Gainer

Optimum Nutrition Serious Mass is a powerful high-calorie mass gainer designed for individuals who want rapid weight gain, muscle size, and strength. With a massive calorie load, protein blend, and added creatine, it supports extreme bulking and recovery—making it ideal for hard gainers and bodybuilders.

Key Benefits & Nutrition

• Calories: 1200+ kcal
• Protein: ~50g
• Carbohydrates: ~250g+
• Creatine: ~3g
• Includes 24 vitamins & minerals for overall health