---
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: "A$241"
currency: AUD
in_stock: true
reviews_count: 13
url: https://www.desertcart.com.au/products/249139682-optimum-nutrition-on-serious-mass-high-protein-muscle-building-weight
store_origin: AU
region: Australia
---

# 25 vitamins & minerals + creatine 50g protein for muscle growth 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:** A$241
**Availability:** ✅ In Stock

## Summary

> 💥 Serious Mass, Serious Gains — Don’t just bulk, dominate your physique!

## 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?** A$241 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/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

- • **Anytime Gain Shake:** Perfect post-workout, between meals, or before bed to maximize muscle mass and size gains.
- • **Calorie Powerhouse:** Fuel your gains with a massive 1,260 calories per serving to crush your weight goals.
- • **Clean Carb Formula:** 252 grams of carbs with zero added sugar to power intense workouts and sustained energy.
- • **Advanced Nutrient Support:** Packed with 25 essential vitamins, minerals, creatine, glutamine, and MCTs for peak performance.
- • **Muscle-Building Protein Boost:** 50 grams of premium protein blend designed for rapid muscle recovery and growth.

## Overview

Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering 1,260 calories and 50 grams of protein per serving, enriched with 25 vitamins, minerals, creatine, and MCTs. Designed for serious muscle growth and recovery, it supports intense training and helps you pack on lean mass 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: Works well for what it is - I bought this mass gainer two months so I can gain weight and put on muscle mass. Let me tell you it worksssss! Over the two months I’ve been taking it I’ve noticed noticeable size gains across my entire body. Though one thing if you were to take this and not train with intensity you’ll gain fat but me since I train five days a week with high intensity per session this mass gainer works very well as my post workout shake and helped significantly to put on muscle mass as well.

## 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 | #1,417 in Health ( See Top 100 in Health ) #58 in Sports Supplements |
| Brand | Optimum Nutrition |
| Country of origin | us |
| Customer Reviews | 4.2 4.2 out of 5 stars (47,615) |
| Customer reviews | 4.2 4.2 out of 5 stars (47,615) |
| 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:** 5.44 kg
- **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/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 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/81kZPQGo-FL.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/8104BIlsdEL.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/81fHl2zRotL.jpg)

## Available Options

This product comes in different **Size, Flavor** options.

## 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

### ⭐⭐⭐⭐⭐ Works well for what it is
*by R***L on 11 December 2022*

I bought this mass gainer two months so I can gain weight and put on muscle mass. Let me tell you it worksssss! Over the two months I’ve been taking it I’ve noticed noticeable size gains across my entire body. Though one thing if you were to take this and not train with intensity you’ll gain fat but me since I train five days a week with high intensity per session this mass gainer works very well as my post workout shake and helped significantly to put on muscle mass as well.

### ⭐⭐⭐⭐ 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 Australia*
*Store origin: AU*
*Last updated: 2026-03-10*