Optimum Nutrition Serious Mass

• Supports Muscle Building & Weight Gain Goals*
• 1,250 Calories Helps Boost Calorie Intake
• 50 g■ Protein Helps Build and Maintain Muscle*
• 253 g Carbs Helps Fuel Intense Workouts
• Naturally & Artificially Flavored
• Protein Powder Supplement
• Informed Choice - We Test You Trust
• Strength Training
• Supports Performance
• Supports Weight Gain Goals

Why Serious Mass™?

• Each serving is packed with 1,250 calories to support a calorie surplus for weight and muscle building.*
• 50 grams of protein to support muscle building and recovery.*
• 253 grams of carbohydrates to support fueling of intense workouts and aid in replenishment of glycogen stores.
• 3 grams of creatine monohydrate to support performance.
• 25 vitamins and minerals plus glutamine.

Optimum Nutrition® has been trusted to provide the highest quality in post-workout recovery, pre-workout energy and on-the-go sports nutrition for over 30 years and in 90+ countries. After careful supplier selection, each ingredient is tested to assure exceptional purity, potency and composition. We hold ourselves to the highest production standards, all so you can unlock your body's full potential. 

Serious Mass™ is designed to provide serious calories, protein and carbohydrates - making this a convenient way to get extra calories throughout your day.

Informed Choice is a quality assurance program for sports nutrition products. The program certifies that nutritional supplements that bear the Informed Choice logo are regularly tested for banned substances by the world class sports anti-doping lab.

■See supplement fact for sodium and cholesterol content

*When taken in addition to normal calorie intake and regular weight resistance training