- Servings
- 16
- Price/serv
- 24.31
- Price
- 389.00
- Format
- Powder
- Servings
- 16
- Price/serv
- 24.31
- Price
- 389.00
- Format
- Powder
Optimum Nutrition Serious Mass Weight Gainer Chocolate 12 LB
(VAT incl.)
Save 58.35
MARHABA15Save 38.90
GOLD10
- 1,260 calories per serving for aggressive mass gain
- 50g of high-quality protein to build and repair muscle tissue
- Up to 253g of carbohydrates for sustained energy and recovery
- Energy & Vitality
- Muscle & Performance
- Weight Management
Certifications & quality
- Informed Choice
Bought direct, checked before it ships
From the brand or its authorised distributor — never resellers
Payment methods
Optimum Nutrition Serious Mass is designed for athletes and hardgainers who struggle to consume enough calories through food alone and need support building muscle mass. Each serving delivers 1,260 calories, 50g of protein, and up to 253g of carbohydrates, plus 5g of creatine monohydrate to support strength and performance. The 12 LB container provides approximately 16 servings of chocolate-flavored shake that you can mix with water or milk.
Corn Maltodextrin — primary carbohydrate source delivering up to 253g of carbs per serving for sustained energy and glycogen replenishment.
Whey Protein Concentrate (Milk) — supplies 50g of high-quality complete protein per serving to drive muscle protein synthesis and recovery.
Creatine Monohydrate — 5g per serving to enhance strength, power output, and lean mass gains backed by extensive sports nutrition research.
Medium Chain Triglycerides (MCTs) — a readily absorbed fat source that contributes additional calorie density without excess bulk.
Mineral Complex — includes magnesium, iron, zinc, manganese, selenium, iodine, copper, chromium, and molybdenum to support metabolic functions and overall athletic health.
Vitamin Blend — a full spectrum of 25 essential vitamins including Vitamin C, Vitamin E, B-complex vitamins, Vitamin A, and Vitamin D for comprehensive nutritional support.
Emulsifier — Lecithins (contains Soy) — ensures smooth mixing and consistent texture with every shake.
Transform your muscle-building journey with Optimum Nutrition Serious Mass, the ultimate high-calorie weight gainer designed for athletes who demand extraordinary results. This powerhouse formula delivers an incredible 1,260 calories per serving, making it the perfect solution for hardgainers and those with intense training regimens who struggle to consume enough calories through food alone.
Every shake packs a massive 50 grams of premium protein to fuel muscle growth and recovery, complemented by up to 253 grams of carbohydrates that provide the energy your body needs to power through demanding workouts and support the muscle-building process. The rich chocolate flavor makes each serving a delicious experience rather than a nutritional chore.
What sets Serious Mass apart is its comprehensive formula that goes beyond basic calories and protein. Each serving includes 5 grams of creatine monohydrate, one of the most researched and effective supplements for strength and performance enhancement. This means you are getting your mass gainer and creatine supplementation in one convenient shake, simplifying your nutrition routine while maximizing results.
How to Use: Mix 2 heaping scoops with 24 fluid ounces of cold water, milk, or your favorite beverage. For optimal results, consume between meals, post workout, or before bed to maximize daily caloric intake. Adjust serving size based on your individual goals and caloric requirements.
Optimum Nutrition has been the gold standard in sports nutrition for decades, trusted by professional athletes and fitness enthusiasts worldwide. Serious Mass continues this legacy with a formula specifically engineered for those who are serious about gaining size, strength, and muscle mass.
FREE shipping on all orders
Estimated delivery: 1–3 business days
14-day hassle-free returns
Every product sold on Avnzor is 100% authentic and sourced directly from authorized distributors.
Allergy information
For allergens, including cereals containing gluten, see ingredients highlighted in bold. May contain traces of gluten, egg, nuts, and peanuts.
Supplement Facts
Supplement Facts
16 servings per container
Other Ingredients:
Maltodextrin, Alkalinized Cocoa, Natural Flavor, Artificial Flavor, Sunflower Lecithin, Soy Lecithin, Acesulfame Potassium, Sucralose
How to Use
Mix 340g (about two heaping scoops) with cold water, milk, or other beverage in a blender for 30 to 45 seconds until dissolved. New users may find it beneficial to begin with half a serving for the first week and then gradually increase to a full serving. For best results, consume regularly over time in combination with regular resistance exercise.
Specs last updated: May 14, 2026
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