Product details

When you are looking to pack on serious size, hit heavy caloric goals, or overcome a fast metabolism, standard protein powders just won’t cut it. Optimum Nutrition Serious Mass is the ultimate weight gain and muscle-building formula engineered specifically for hardgainers, athletes, and anyone struggling to build real mass.

Delivering a massive, calorie-dense matrix of complex carbohydrates and high-quality protein, this iconic formula gives your body the heavy-duty nutrition it needs to fuel intense workouts and support serious size gains—all wrapped in a rich, delicious chocolate flavour.

Key Features & Benefits

1,250 High-Energy Calories: Provides a dense surplus of quality calories per serving (mixed with water) to help hardgainers consistently hit their daily energy surplus.
50g Muscle-Building Protein Blend: Combines fast- and slow-digesting protein sources (whey protein concentrate, calcium caseinate, and egg albumin) to keep your muscles continuously supplied with essential amino acids.
Over 250g of Complex Carbs: Loaded with complex carbohydrates to replenish glycogen stores after brutal training sessions and fuel high-intensity performance without added sugar overload.
25+ Vitamins & Essential Minerals: Fortified with a comprehensive vitamin and mineral blend to support metabolic rate, healthy immune function, and overall physical vitality.
Enhanced with Creatine & Glutamine: Contains Creatine Monohydrate for maximum power, strength, and cell volume, along with L-Glutamine to promote rapid post-workout muscle recovery.

Product Specifications

Attribute	Details
Calories per Serving	1,250 kcal (with water) / 1,600+ kcal (with low-fat milk)
Protein Content	50 g per serving (2 scoops / 334 g)
Carbohydrate Content	~252g per serving
Added Key Ingredients	Creatine Monohydrate, L-Glutamine, Vitamin & Mineral Blend
Flavour Profile	Rich Chocolate
Best Used For	Weight Gain, Bulk Phases, Hardgainers, Post-Workout Recovery

How to Use

Scoop: Add 2 heaping scoops (approx. 334 g) of Serious Mass into a large blender or shaker. (New users may prefer starting with a 1-scoop half-serving daily for the first week to assess tolerance).
Blend: Add 24 oz (approx. 710 ml) of cold water or low-fat milk.
Mix: Blend for 45–60 seconds. Adding ice cubes, fruit, peanut butter, or oats can create a custom high-calorie gourmet shake.
Timing:
- Between Meals: Drink ½ to 1 serving between meals to maintain a high-calorie intake throughout the day.
- Post-Workout: Drink ½ to 1 serving 30–45 minutes following exercise to accelerate recovery.
- Before Bed: Drink ½ to 1 serving about 45–60 minutes before sleep to provide nutrients to recovering muscles overnight.