Optimum Nutrition (ON) Serious Mass 12 LB

Optimum Nutrition Serious Mass is a powerful mass-gain formula created for athletes and individuals who struggle to meet caloric needs. Each two-scoop serving provides approximately 1,250–1,260 calories, 50 g complete whey protein, 250–256 g fast-digesting carbohydrates, 5 g creatine, 8 g glutamine, and 11 g BCAAs . Fortified with 19 essential vitamins and minerals, this shake supports energy production, immune health, and muscle recovery . It’s ideal for those who need substantial caloric support, whether post-workout, between meals, or before bed.

Key Benefits

• Supplies 1,250 calories per serving to fuel calorie surplus 

• Delivers 50 g protein to support muscle repair and growth 

• Includes 250+ g carbs to replenish glycogen and sustain energy 

• Contains 5 g creatine monohydrate for strength and power support 

• Provides 8 g glutamine and 11 g BCAAs for recovery and immune support 

• Enriched with 19 vitamins and minerals for overall nutrition support 

How to Use

1. Mix 2 level scoops (~334 g) with 710 ml of water or milk in a blender.

2. Blend for 30–45 seconds until smooth.

3. Beginners: Start with half serving (~1 scoop) and gradually increase.

4. Consume post-workout, between meals, or before bed to meet daily calorie goals .

Results

• Supports significant weight and muscle gain for hard gainers 

• Improves strength and recovery due to carb and creatine blend

• Provides convenient calorie intake without feeling overly full

Product Details

• Size: 12 lb (~5.44 kg, ~16 servings at full dose)

• Calories: 1,250 per serving

• Protein: 50 g; Carbs: ~250 g; Fat: ~5 g

• Contains creatine monohydrate, glutamine, BCAAs, vitamins, minerals

• Form: Powder, instantized for easy blending 

• Suitable for vegetarians; banned-substance tested

• Flavors: Chocolate, Vanilla, Strawberry, Cookies & Cream, Banana 

Why Buy from MAXESFIT

• 100% authentic Optimum Nutrition product

• Fresh stock stored under optimal conditions

• Fast, secure delivery across UAE & GCC

• Cash-on-delivery and secure payment options

• Trusted by thousands of fitness athletes

• Expert guidance on how to use mass gainers effectively