---
product_id: 249139682
title: "Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Powder, 50 Grams of Protein, Immune Support - Chocolate, 12 Lbs (5.44 KG) pack may vary"
brand: "optimum nutrition"
price: "€ 138.05"
currency: EUR
in_stock: true
reviews_count: 13
url: https://www.desertcart.ie/products/249139682-optimum-nutrition-on-serious-mass-high-protein-muscle-building-weight
store_origin: IE
region: Ireland
---

# 25 vitamins & minerals + creatine 50g protein for muscle recovery 1,260 calories/serving Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Powder, 50 Grams of Protein, Immune Support - Chocolate, 12 Lbs (5.44 KG) pack may vary

**Brand:** optimum nutrition
**Price:** € 138.05
**Availability:** ✅ In Stock

## Summary

> 💥 Bulk smarter, not harder with Serious Mass!

## Quick Answers

- **What is this?** Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Powder, 50 Grams of Protein, Immune Support - Chocolate, 12 Lbs (5.44 KG) pack may vary by optimum nutrition
- **How much does it cost?** € 138.05 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/249139682-optimum-nutrition-on-serious-mass-high-protein-muscle-building-weight)

## Best For

- optimum nutrition enthusiasts

## Why This Product

- Trusted optimum nutrition brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Clean Carb Source:** 252 grams of carbs with zero added sugar to keep your energy steady and clean.
- • **Anytime Muscle Fuel:** Perfect for between meals, post-workout, or before bed—never miss a growth window.
- • **Massive Calorie Boost:** Fuel your gains with 1,260 calories per serving—no fluff, just pure power.
- • **Nutrient-Rich Formula:** 25 essential vitamins & minerals plus creatine, glutamine, and MCTs for holistic support.
- • **Protein-Packed Performance:** 50 grams of premium protein blend to accelerate muscle repair and growth.

## Overview

Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering 1,260 calories, 50 grams of protein, and 252 grams of carbs per serving, enriched with 25 vitamins, minerals, creatine, glutamine, and MCTs. Designed for serious muscle growth and recovery, it’s the go-to formula for professionals committed to leveling up their physique efficiently.

## Description

Product Description Serious Mass is the ultimate in weight gain formulas. With 1,260 calories per serving and 50 grams of protein for muscle recovery support, this instantized powder makes the ideal post-workout and between meals shake for sizing up your goals. Serious Mass provides you with the tools you need to pack on the pounds and help you develop the physique you’ve always wanted. Set Contains: 1

Review: this good - this good
Review: هل يزيد بالوزن - Good product fast delivery

## Features

- High-calorie weight gain formula, with a carb protein ratio of 5:1
- 50 grams of protein, 252 grams of carbohydrates (with no added sugar) per serving
- Includes 25 vitamins and minerals, creatine, glutamine and MCTs
- 1,260 calories per serving mixed with water
- Take between meals, after weight training and before bed

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000GIPJ0M |
| ASIN  | B000GIPJ0M |
| Additives | Maltodextrin, Protein Blend (Whey Protein Concentrate, Calcium Caseinate, Egg Albumen, Sweet Dairy Whey), Cocoa (Processed with Alkali), Natural and Artificial Flavors, Vitamin and Mineral Blend (Dipotassium Phosphate, Magnesium Aspartate, Dicalcium Phosphate, Calcium Citrate, Ascorbic Acid, Niacinamide, Zinc Citrate, Beta Carotene, d-Calcium Pantothenate, d-alpha Tocopheryl Succinate, Selenomethi… |
| Age Range Description | Adult |
| Allergen Information | Soy |
| Best Sellers Rank | #1,337 in Health ( See Top 100 in Health ) #51 in Sports Supplements |
| Brand | Optimum Nutrition |
| Country of origin | us |
| Customer Reviews | 4.2 4.2 out of 5 stars (46,994) |
| Customer reviews | 4.2 4.2 out of 5 stars (46,994) |
| Date First Available | 6 August 2012 |
| Format | Powder |
| Is Discontinued By Manufacturer  | No |
| Item model number  | 1101529 |
| Manufacturer  | Optimum Nutrition |
| Product Dimensions  | 29.21 x 13.97 x 40.64 cm; 5.44 kg |
| Product Name | HEALTH_PERSONAL_CARE |
| Serving Recommendation | One Scoop |
| Units | 1 Count |
| Weight | 12 Pounds |

## Product Details

- **Brand:** Optimum Nutrition
- **Flavour:** Chocolate
- **Item weight:** 12 Pounds
- **Material type free:** Sugar Free
- **Servings per container:** 16

## Images

![Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Powder, 50 Grams of Protein, Immune Support - Chocolate, 12 Lbs (5.44 KG) pack may vary - Image 1](https://m.media-amazon.com/images/I/715lYFM1cmL.jpg)
![Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Powder, 50 Grams of Protein, Immune Support - Chocolate, 12 Lbs (5.44 KG) pack may vary - Image 2](https://m.media-amazon.com/images/I/71GyLeR3KCL.jpg)
![Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Powder, 50 Grams of Protein, Immune Support - Chocolate, 12 Lbs (5.44 KG) pack may vary - Image 3](https://m.media-amazon.com/images/I/71HjvVnPj5L.jpg)
![Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Powder, 50 Grams of Protein, Immune Support - Chocolate, 12 Lbs (5.44 KG) pack may vary - Image 4](https://m.media-amazon.com/images/I/71o0KRKcbVL.jpg)
![Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Powder, 50 Grams of Protein, Immune Support - Chocolate, 12 Lbs (5.44 KG) pack may vary - Image 5](https://m.media-amazon.com/images/I/81-HTFNgA1L.jpg)

## Questions & Answers

**Q: Can I need one kg**
A: Dear Valued Customer,

I hope this message finds you well.

We wanted to inform you that Optimum Serious Mass in the 1 kg variant is currently not in production by the company. However, we do have the following options available:

Optimum Nutrition (ON) Serious Mass: Chocolate, 12 Lbs (5.44 KG)
Optimum Nutrition (ON) Serious Mass: Chocolate, 6lb (2.73 KG)

Thank You!

**Q: When the date of expiry?**
A: 1 year ahead is the minimum requirement of all nutritional stuff in Amazone

**Q: Is there a version of this product without creatine?**
A: Hi,
This product contains Creatine. There is no version of this product without creatine.

**Q: What is the expiry date ?**
A: October/2022

## Customer Reviews

### ⭐⭐⭐⭐⭐ this good
*by H***L on 29 December 2025*

this good

### ⭐⭐⭐⭐⭐ هل يزيد بالوزن
*by H***L on 10 December 2025*

Good product fast delivery

### ⭐⭐⭐⭐ Will recommend
*by M***. on 3 December 2025*

It works superbly

## Frequently Bought Together

- Optimum Nutrition Serious Mass, Weight Gainer Protein Powder with Creatine
- Nutricost Creatine Monohydrate Micronized Powder 500G, 5000mg Per Serv (5g) - 100 Servings, 17.9 Oz
- VELOMIX -2 Pack- 28 oz Protein Shaker Bottles for Protein Mixes - 2x Wire Whisk | Leak Proof Shaker Cups for Protein Shakes | Protein Shaker Bottle Pack | Shakers for Protein Shakes-Black&Transparent

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-02*