---
product_id: 52527146
title: "Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary"
brand: "optimum nutrition"
price: "€ 284.36"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.hr/products/52527146-optimum-nutrition-serious-mass-protein-powder-high-calorie-mass-gainer
store_origin: HR
region: Croatia
---

# 3g Creatine for peak power 50g Protein muscle boost 1250+ CAL per serving Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary

**Brand:** optimum nutrition
**Price:** € 284.36
**Availability:** ✅ In Stock

## Summary

> 🚀 Serious Mass: Bulk up like a pro, no excuses.

## Quick Answers

- **What is this?** Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary by optimum nutrition
- **How much does it cost?** € 284.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/52527146-optimum-nutrition-serious-mass-protein-powder-high-calorie-mass-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

- • **Performance Edge:** 3 grams of creatine monohydrate to push your workouts beyond limits.
- • **Calorie Powerhouse:** Fuel your gains with 1250+ calories per serving—because average just won’t cut it.
- • **Muscle Growth Amplifier:** 50 grams of premium protein to sculpt and repair your physique faster.
- • **Vitamin & Mineral Boost:** 25 essential vitamins and minerals to keep your body optimized and recovery rapid.
- • **Flavor Variety & Flexibility:** Six crave-worthy flavors including Chocolate Peanut Butter—customize your shake with fruits or nut butters for next-level taste and calories.

## Overview

Optimum Nutrition Serious Mass is a high-calorie mass gainer designed for serious athletes and professionals aiming to maximize muscle growth and recovery. Each serving delivers over 1250 calories, 50 grams of protein, 250 grams of carbs, and 3 grams of creatine monohydrate, enriched with 25 essential vitamins and minerals. Available in six delicious flavors, it’s the ultimate post-workout or between-meal shake to fuel intense training and rapid weight gain.

## Description

Product Description Optimum Nutrition has been helping performance-focused athletes for over 35 years achieve their goals. This time, we bring you the intense and dialled-up version of our muscle-building and weight gain formula. Meet the Serious Mass high-calorie protein powder, designed for true sports enthusiasts and high-performance athletes. Serious Mass is the ultimate muscle-building and mass gainer formula. This protein powder makes the ideal post-workout and between meals shake for sizing up your goals. Every serving of this mass gainer contains 25 essential vitamins and minerals (including vitamin D, B12, E, Biotin and Magnesium), over 1,250 calories to boost your calorie intake, 50 grams of protein to support muscle growth* and 250 grams of carbohydrates helping support muscle recovery**. Plus, every serving has also been enriched with 3 grams of creatine monohydrate that increases your physical performance during high-intensity exercise***. Designed for the goal-focused athlete, our ON Serious Mass High Calorie Weight Gainer protein powder comes in 6 great tasting flavours: banana, chocolate peanut butter, chocolate, cookies & cream, strawberry and vanilla. Blend this quality protein with fruit or nut butter for extra calories and discover your optimum taste combination. Serious Mass is quick, convenient, and easy to prepare: simply mix 2 heaped scoops with 710 ml of water or plant milk. Use it after intense training as a part of your recovery routine, between meals, and before bed to add calories, carbs, and protein to your healthy, balanced diet. * Source: EFSA Journal 2010;8(10):1811; 2011;9(6):2203 ** Source: EFSA Journal 2011;9(6):2211 ***Source: EFSA Journal 2011;9(7):2303 Ingredients Corn Maltodextrin Whey Protein Milk (Emulsitier: Lecithin [Soyiy e nced Cocoa Powder, Crecide, Selenum Flayuring, MILK Minerals Complex, Minerals (Magnesium, Iron, Zinc, Manganese, Chromium), Vitamins (C. E. B3, A, B5, B7. B12, B9, D, B6, B1, K, B2), Salt Stabilisers (Cellulose Gum, Guar Gum Carrageenan). Sweetenor (succalose) Directions Add 2 heaped scoops (330 g) of Serious Mass to a blender filled with 710 ml (24 oz) of water. Blend for 45-60 seconds. Then add a few ice cubes and, if desired, other calorie-contributing ingredients (see "Supercharge Your Serious Mass" on the opposite panel) and blend for an additional 30-45 seconds. TIP: New users may find it beneficial to begin with 1/2 a serving daily for the first week and then gradually increase to 1 or more full servings several times a day. Safety Warning Do not exceed the recommended daily dose. Dietary supplements are not a substitute for a balanced and varied diet. Food supplements should be kept out of the reach of children. Manufacturer Contact Information 4 Waterside, Dublin 24, Ireland

Review: The best mass gainer I’ve bought. - Being 6 foot 4 and naturally quite skinny, I’ve always struggled to put on weight. I have a very active job as well which doesn’t help. I’ve used this product for just over one week and have put on 5 kilos in that time, using two shakes a day, one late afternoon and one after the gym. Taste is excellent, the chocolate peanut butter and cookies and cream are fantastic just with water. The only draw back for me is the size of the scoops. Difficult to mix and pour into a standard 700ml protein mixer. However I bought a 1 litre one and it’s now not a problem. Overall this is the best protein powder I’ve ever had. Taste, weight gain and price.
Review: Exactly as expected. Huge weigh gain in little time. - I'm a skinny guy who's always fluctuated around 58-60kg. After 4 days of use I am already at 62.3kg. Some advice with this product is to not use a full serving. It's way too much for someone small trying to gain weight. Instead you should do a half serving (1 scoop and 300ml of milk) twice a day. This stops you getting the stomach problems that others have mentioned. It doesn't mix very well. You need a strong blender or a tornado shaker. Manual shaking just ends up with a huge clump of mushy powder. Taste is okay. I went for chocolate peanut butter and it's not exactly tasty, but it's not bad either. I usually drink it quickly so taste isn't a big thing for me, as long as it's not revolting or super synthetic.

## Features

- Low fat mass gainer with over 1250 CALORIES and 50g of PROTEIN per serving to support muscle growth* plus 3 grams of CREATINE MONOHYDRATE to support performance**
- No added sugar protein powder formula with 25 vitamins and minerals and less than 5g fat per serving, plus over 250 grams of CARBOHYDRATES helping support muscle recovery***
- Serious Mass protein powder comes in 6 flavours (banana, chocolate peanut butter, chocolate, cookies & cream, strawberry and vanilla) & contains sweetener
- To prepare weight gainer mix 2 scoops with 710 ml of water or plant milk, add fruit or nut butters for a tasty and calorific post workout or between meals protein smoothie
- Source EFSA Journal *2010;8(10):1811; 2011;9(6):2203; ** 2011;9(7):2303; ***2011; 9(7):2303

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B015WMRVKW |
| Age Range Description | Adult |
| Allergen Information | Contains: Egg may contain, Gluten may contain, Milk, Peanuts may contain, Soy, Tree nuts may contain |
| Benefits | Muscle Growth, Weight Gain |
| Best Sellers Rank | 1,198 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 23 in Whey Nutrition Protein |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.4 out of 5 stars 897 Reviews |
| Diet Type | Vegetarian |
| Diet type | Vegetarian |
| Flavour | Chocolate Peanut Butter |
| Global Trade Identification Number | 05060245607650 |
| Item Dimensions | 30 x 14 x 42 centimetres |
| Item Weight | 5.45 Kilograms |
| Item weight | 5.45 Kilograms |
| Manufacturer | Optimum Nutrition |
| Manufacturer Contact Information | 4 Waterside, Dublin 24, Ireland |
| Manufacturer Part Number | 1101534 |
| Material Type Free | Sugar Free |
| Model Name | Serious Mass 5.45kg |
| Model Number | 1101534 |
| Net Content Volume | 13.88 Litres |
| Number of Items | 1 |
| Package Type Name | Tub |
| Servings per container | 16 |
| Total Servings Per Container | 16 |
| Unit Count | 5450.0 Grams |

## Product Details

- **Brand:** Optimum Nutrition
- **Diet type:** Vegetarian
- **Flavour:** Chocolate Peanut Butter
- **Item weight:** 5.45 Kilograms
- **Material Type Free:** Sugar Free
- **Number of items:** 1
- **Product benefits:** Muscle Growth, Weight Gain
- **Recommended uses for product:** Post-Workout, Pre-Workout
- **Servings per container:** 16
- **Unit count:** 5450.0 gram

## Images

![Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary - Image 1](https://m.media-amazon.com/images/I/71IB0L5MThL.jpg)

## Available Options

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

## Questions & Answers

**Q: What's new with Serious Mass?**
A: Not only does Serious Mass have a fresh new look, but it also has added 3 grams of creatine to support your performance.

**Q: The label looks different compared to the previous one I got, is it still the same OPTIMUM NUTRITION product?**
A: As you evolve, so do we. The part of our mission is to help active individuals better understand OPTIMUM NUTRITION products. Now choosing the right product for you is easier with more visible product benefits, features and flavours on each tub.

**Q: The tub is not full to the brim when opened, why is that?**
A: This is completely normal and is to do with the way the powder is vacuum packed into the tub. The powder settles over time. This does not impact the weight or number of servings listed on the label.

**Q: What is the best way to prepare Serious Mass drink?**
A: To get the optimal consistency and prepare your drink in easy and convenient way, we recommend using a blender. For optimal use, follow serving instructions on pack.

**Q: Are the ingredients tested and safe?**
A: All of the ingredients in our products have been approved and considered safe for consumption by the European Food Safety Authority.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The best mass gainer I’ve bought.
*by J***Y on 6 June 2018*

Being 6 foot 4 and naturally quite skinny, I’ve always struggled to put on weight. I have a very active job as well which doesn’t help. I’ve used this product for just over one week and have put on 5 kilos in that time, using two shakes a day, one late afternoon and one after the gym. Taste is excellent, the chocolate peanut butter and cookies and cream are fantastic just with water. The only draw back for me is the size of the scoops. Difficult to mix and pour into a standard 700ml protein mixer. However I bought a 1 litre one and it’s now not a problem. Overall this is the best protein powder I’ve ever had. Taste, weight gain and price.

### ⭐⭐⭐⭐⭐ Exactly as expected. Huge weigh gain in little time.
*by A***R on 16 November 2024*

I'm a skinny guy who's always fluctuated around 58-60kg. After 4 days of use I am already at 62.3kg. Some advice with this product is to not use a full serving. It's way too much for someone small trying to gain weight. Instead you should do a half serving (1 scoop and 300ml of milk) twice a day. This stops you getting the stomach problems that others have mentioned. It doesn't mix very well. You need a strong blender or a tornado shaker. Manual shaking just ends up with a huge clump of mushy powder. Taste is okay. I went for chocolate peanut butter and it's not exactly tasty, but it's not bad either. I usually drink it quickly so taste isn't a big thing for me, as long as it's not revolting or super synthetic.

### ⭐⭐⭐⭐⭐ Solid Product
*by A***R on 20 December 2016*

Wanted to gain and it worked. Taste- 4.5/5 I'm not sure if I will ever be fully satisfied with the taste of a protein shake however this does come quite close (peanut butter and chocolate). Comparing this brand to others it definitely has an edge in terms of taste- with water or milk. Product 4.5/5 Comes with a scoop which is usually hidden inside the powder so do search for it! Great for those looking to gain. Not so much to do with the actual product but when delivered some managed to spill out but nothing too major- downside of not coming in a tub. Highly recommended product, great taste, great results. Found this helpful? Let me know!

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-20*