Optimum Nutrition Serious Mass Weight Gainer Protein Powder 12lbs(5.55kg) 16Servings

Regular Price: KSh12,499.00

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Optimum Nutrition Serious Mass Weight Gainer (High-Calorie Protein Powder)

Gain Size. Build Muscle. Fuel Your Growth.

Struggling to gain weight? Serious Mass delivers the calories, protein, and carbs you need to grow bigger and stronger.

Optimum Nutrition Serious Mass is a high-calorie weight gainer designed to support muscle building and weight gain. With up to 1260 calories, 50g protein, 250g+ carbs, and added creatine, it fuels intense workouts and helps you achieve your bulking goals faster.

Why a Weight Gainer?

If you find it hard to eat enough calories daily, a weight gainer helps you easily increase your intake, supporting muscle growth, recovery, and overall performance.

Key Benefits

Massive Calorie Intake Support:
Provides an extremely high-calorie formula that helps you achieve a consistent calorie surplus for fast weight gain and muscle growth.
Lean Muscle Growth:Delivers a protein-rich blend that supports muscle repair, recovery, and lean muscle development.
Strength & Performance Boost:Enhances training performance, allowing for improved strength, endurance, and lifting capacity.
Faster Muscle Recovery:Helps reduce post-workout muscle breakdown and supports quicker recovery after intense training.
Trusted Global Brand Quality:From Optimum Nutrition, one of the world’s most respected supplement brands for performance nutrition.

Features

High-Protein Formula:
Provides essential amino acids needed for muscle repair and growth.
Complex Carbohydrate Blend:Delivers sustained energy and replenishes glycogen stores after workouts.
Creatine Enriched:Supports improved strength, power output, and training performance.
Vitamin & Mineral Complex:Helps support immunity, energy production, and overall health during intense training.
16 Servings Bulk Size:Ideal for consistent use during bulking cycles and long-term muscle gain goals.

Who It’s For

Hard gainers struggling to add weight
Bodybuilders and strength athletes
Gym beginners starting a bulking phase
Anyone needing high-calorie support for muscle growth

Why Choose Serious Mass?

One of the most trusted weight gainers worldwide
Complete formula: calories, protein, carbs, creatine
Ideal for bulking and high-performance goals
Great taste with multiple flavor options

For best results, use daily as part of your bulking nutrition plan:

Mix 1 serving (as per label instructions) with 500–700ml of water or milk
Blend thoroughly until smooth
Take 1 serving daily or split into 2 smaller servings

Best Time to Take:

Post-workout: For muscle recovery and glycogen replenishment
Between meals: To increase daily calorie intake
Morning (optional): For individuals with high calorie needs

Pro Tips for Faster Results:

Use full cream milk instead of water for extra calories
Add oats, peanut butter, or bananas for a high-calorie shake

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Let customers speak for us

from 24 reviews

I’ve been using the USN Vitablitz Capsules for a little while now, and I’m really impressed with the results. You can genuinely feel the difference throughout the day more sustained energy, better focus, and an overall sense of wellbeing.
It’s simple to take and fits perfectly into my daily routine, which makes staying consistent easy. What I appreciate most is how it supports you without feeling overwhelming ,just a steady, noticeable boost every day.
If you’re looking for a reliable multivitamin that actually makes a difference, I’d definitely recommend giving this a try.

Pancras Kihimah

04/18/2026