Optimum Nutrition Serious Mass – High-Calorie Weight Gainer Take your bulking to the next level with Optimum Nutrition Serious Mass — one of the most popular and proven mass gainers designed to help you build size, strength, and overall body weight. Built for hard gainers and athletes who struggle to hit their calorie targets, Serious Mass delivers a powerful combination of calories, protein, carbohydrates, and added performance ingredients in one convenient shake. Serious Size Starts Here Gaining weight requires a calorie surplus — and for many, eating enough food alone can be a challenge. Serious Mass makes it easier by packing over 1,200 calories per serving, helping you increase daily intake without constantly eating. Key Benefits High-Calorie Formula for Weight GainDelivers approximately 1,250 calories per serving, ideal for bulking phases and hard gainers. 50g Protein for Muscle GrowthSupports muscle repair and growth with a blend of quality proteins. High Carbohydrate Content for EnergyOver 250g of carbs per serve helps fuel workouts and replenish glycogen stores. Added Creatine for Strength & SizeIncludes creatine monohydrate to support power, performance, and muscle gains. Vitamins, Minerals & GlutamineFortified with over 20 micronutrients to support overall health and recovery. Built for Serious Results Serious Mass is designed for those who: Struggle to gain weight or size Have fast metabolisms Need extra calories to support intense training Want a convenient way to increase daily intake Whether used post-workout or between meals, it’s an easy way to stay in a calorie surplus and support consistent growth. How to Use Mix 2 scoops with water or milk for a full serving, or start with half a serving if you’re new. You can also blend it with foods like oats, peanut butter, or fruit to increase calories even further. Bulk Up the Smart Way If you’re serious about gaining size, strength, and muscle, Optimum Nutrition Serious Mass gives you the calories and nutrients needed to grow — without the hassle of constant eating.
