Optimum Nutrition Serious Mass

High-calorie, high-protein formula designed to support weight gain, muscle building, and recovery. Each serving delivers 50g of protein and 1200+ calories to fuel your workouts and help you reach your goals faster.

Product Overview

Serious Mass is the ultimate weight gain and muscle-building formula. With over 1200 calories and 50 grams of protein per 2-scoop serving, it provides the ideal post-workout and between-meals shake to help you achieve your size and strength goals. This formula is designed for those who need high-calorie, high-protein support — not as a low-calorie protein supplement.

Key Benefits

• High-calorie, high-protein formula supports weight gain and muscle building
• 50g protein per serving to help build and maintain lean muscle
• 1200+ calories per serving to fuel your workouts
• 256g carbohydrates per serving to support energy and recovery
• Added 3g Creatine and 1g Glutamine for muscle performance
• 24 essential vitamins and minerals included
• Banned substance tested and suitable for vegetarians

Product Specifications

Suggested Use

When to Use: Use post-workout and/or between meals to add calories, carbohydrates, and protein to your diet.

How to Use: Mix 2 scoops into 710 ml (24 fl oz) of cold water or milk using an electric blender. You can also add fruits, peanut butter, or other calorie-contributing foods. TIP: New users should start with 1 scoop as a half serving.

Not for medicinal use. This product is intended as a food for special dietary use for weight gain only. Consume adequate protein daily from a combination of high-protein foods and supplements as part of a balanced diet and exercise program.