---
product_id: 249864769
title: "(ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Strawberry, 12 Lbs (5.44 KG)"
brand: "optimum nutrition"
price: "¥39306"
currency: JPY
in_stock: true
url: https://www.desertcart.jp/products/249864769-on-serious-mass-high-protein-muscle-building-and-weight-gainer
store_origin: JP
region: Japan
---

# 250g carbs, zero added sugar 50g premium protein blend 1250 Calories power boost (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Strawberry, 12 Lbs (5.44 KG)

**Brand:** optimum nutrition
**Price:** ¥39306
**Availability:** ✅ In Stock

## Summary

> 💥 Bulk up smarter, not harder with Serious Mass!

## Quick Answers

- **What is this?** (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Strawberry, 12 Lbs (5.44 KG) by optimum nutrition
- **How much does it cost?** ¥39306 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/249864769-on-serious-mass-high-protein-muscle-building-and-weight-gainer)

## 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

- • **Carb-Loaded Energy:** Over 250 grams of carbohydrates with zero added sugar to keep your energy levels sky-high.
- • **Immune Support Boost:** Infused with Vitamin C, Zinc, and Vitamin D to keep you strong inside and out.
- • **Massive Calorie Surge:** Fuel your gains with 1,250 clean calories per serving—no fluff, just pure muscle fuel.
- • **Advanced Recovery Formula:** Includes Creatine, Glutamine, and Glutamic Acid for faster recovery and sustained performance.
- • **Protein-Packed Powerhouse:** 50 grams of blended protein to maximize muscle repair and growth after every workout.

## Overview

Optimum Nutrition's Serious Mass is a 12 lb strawberry-flavored weight gainer powder delivering 1,250 calories, 50 grams of protein, and 250+ grams of carbs per serving. Enhanced with 25 vitamins and minerals plus immune-supporting nutrients, it’s designed for serious muscle growth and recovery without added sugars.

## Description

Optimum Nutrition (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Strawberry, 12 Lbs (5.44 KG)

## Features

- Adding calories has never been this easy or tasted so good
- 1,250 Calories
- 50 Grams of blended protein
- Over 250 Grams of carbohydrates with no added sugar
- Creatine, Glutamine and Glutamic Acid and 25 Vitamins and essential minerals
- Packaging may vary

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Name | HEALTH_PERSONAL_CARE |
| Additives | L-Glutamine |
| Allergen Information | Milk, Soy |
| Weight | 12.83 Pounds |
| Units | 1 Count |
| Serving Recommendation | 334 Grams |
| Country of origin | us |
| Brand | Optimum Nutrition |
| Format | Powder |
| Age Range Description | Adult |

## Product Details

- **Brand:** Optimum Nutrition
- **Flavour:** Strawberry
- **Servings per container:** 16
- **Item weight:** 5.44 kg
- **Material type free:** Caffeine Free

## Images

![(ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Strawberry, 12 Lbs (5.44 KG) - Image 1](https://m.media-amazon.com/images/I/814o1QYGHDL.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

## Frequently Bought Together

- Optimum Nutrition Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Strawberry, 12 Pound (Packaging May Vary)
- Optimum Nutrition Micronized Creatine Monohydrate Powder, Unflavored, 120 Servings, 600 Grams (Packaging May Vary)
- 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 Japan*
*Store origin: JP*
*Last updated: 2026-02-05*