Optimum Nutrition Serious Mass is a high-calorie mass gainer designed to support muscle building, weight gain, and intense training performance. Built for hard gainers and athletes with high-calorie needs, this formula delivers a powerful combination of protein, carbohydrates, creatine, and key nutrients in one convenient shake.
Each full serving provides up to 1,260 calories, 50g of protein, up to 253g of carbohydrates, and 5g of creatine monohydrate—making it an effective solution for those looking to increase size, strength, and overall caloric intake.
Maximum Calorie Formula: One of the highest-calorie mass gainers available, designed for individuals with serious bulking goals.
All-in-One Shake: Combines protein, carbs, creatine, amino acids, and micronutrients in a single serving.
Whey-Based Protein: Uses fast-digesting whey protein concentrate to support rapid amino acid delivery.
Whey Protein Concentrate: Provides complete amino acids to support muscle growth and recovery.
Carbohydrate Blend: Supplies high levels of carbohydrates to support energy, performance, and glycogen replenishment.
Creatine Monohydrate (5g): Supports strength, power output, and training performance.
Glutamine & Amino Acids: Includes naturally occurring glutamine, BCAAs, and EAAs to support recovery and muscle protein synthesis.
Vitamin & Mineral Complex: Supports immune health, energy metabolism, and overall wellness.
Calorie Surplus Support: Helps create the calorie surplus needed for weight gain and muscle growth.
Muscle Recovery & Growth: Protein and amino acids support muscle repair and development after training.
Energy & Performance: Carbohydrates and creatine work together to support workout intensity and recovery.
Mixing Instructions: Blend 2 heaping scoops (340g) with cold water, milk, or your preferred beverage for 30–45 seconds.
New Users: Start with 1/2 serving daily for the first week, then gradually increase to a full serving.
Best Use: Consume regularly in combination with resistance training to support muscle-building goals.
Note: This product is intended to support weight gain and performance as part of a structured training and nutrition program. Always review the product label for the most accurate ingredient, usage, and safety information.
Important: Always read and follow label directions before use. Consult a qualified healthcare professional prior to using this product if you are pregnant, nursing, have a medical condition, or are taking medication. Discontinue use if adverse reactions occur.
