---
product_id: 48512094
title: "Nutrition One Stop® Xtreme - Serious Mass Gainer - All in One Protein Powder - 55g Protein, 10.3g BCAAs, 5,000mg Creatine - Muscle Building Protein Shake (Chocolate Perfection, 4.35kg)"
brand: "reflex"
price: "964 zł"
currency: PLN
in_stock: true
reviews_count: 8
category: "Reflex"
url: https://www.desertcart.pl/products/48512094-nutrition-one-stop-xtreme-serious-mass-gainer-all-in-one
store_origin: PL
region: Poland
---

# 5,000mg Creapure® Creatine Digezyme® Digestive Enzymes & LAB2PRO® Probiotics 55g Protein per serving Nutrition One Stop® Xtreme - Serious Mass Gainer - All in One Protein Powder - 55g Protein, 10.3g BCAAs, 5,000mg Creatine - Muscle Building Protein Shake (Chocolate Perfection, 4.35kg)

**Brand:** reflex
**Price:** 964 zł
**Availability:** ✅ In Stock

## Summary

> 🔥 Bulk smarter, recover faster, and own your gains 💥

## Quick Answers

- **What is this?** Nutrition One Stop® Xtreme - Serious Mass Gainer - All in One Protein Powder - 55g Protein, 10.3g BCAAs, 5,000mg Creatine - Muscle Building Protein Shake (Chocolate Perfection, 4.35kg) by reflex
- **How much does it cost?** 964 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/48512094-nutrition-one-stop-xtreme-serious-mass-gainer-all-in-one)

## Best For

- reflex enthusiasts

## Why This Product

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

## Key Features

- • **All-in-One Powerhouse:** Simplify your stack with one shake delivering protein, BCAAs, creatine & more.
- • **Muscle Growth Maximized:** 55g premium whey protein from grass-fed cows fuels serious gains.
- • **Endurance & Strength Boost:** 5,000mg Creapure® creatine enhances high-intensity workout performance.
- • **Clean & Conscientious Formula:** Halal certified, hormone-free, zero added sugars, and no artificial colors or soy.
- • **Optimized Digestion & Absorption:** Digezyme® enzymes + LAB2PRO® friendly bacteria ensure nutrient uptake without bloat.

## Overview

Reflex Nutrition One Stop® Xtreme is a premium all-in-one mass gainer protein powder designed for serious athletes and bodybuilders. Each 145g serving packs 55g of high-quality whey protein, 10.3g BCAAs, and 5,000mg of Creapure® creatine to support muscle growth, strength, and endurance. Enhanced with digestive enzymes and probiotics for optimal absorption, plus essential vitamins and minerals to maintain immune and hormonal health. Halal certified, hormone-free, and free from added sugars and artificial colors, it offers a clean, delicious chocolate flavor in a large 4.35kg tub—perfect for those committed to maximizing gains with convenience and quality.

## Description

Product Description One Stop Xtreme is your one stop shop to extremely quality gains. Want all your protein supplements in one shake? Look no further. One Stop® Xtreme weight gain milkshake from Reflex Nutrition is the ultimate choice for serious athletes and bodybuilders seeking comprehensive nutritional support in a single high protein shake. This high calorie weight gain protein powder is not just a supplement; it's a powerhouse blend designed to fuel intense training sessions and facilitate muscle gains. Formulated to replace a multitude of individual supplements, this bulking protein powder offers an impressive profile of 55g of protein, 10.3g of BCAAs, a combination of 71g of high and low GI carbohydrates, and a substantial 5,000mg of premium Creapure® Creatine per 145g serving. This meticulously crafted blend supports muscle recovery and sustained energy, making it ideal for those looking to bulk up effectively and efficiently. In addition to its core macronutrients, One Stop® Xtreme mass protein powder is enriched with the Digezyme® digestive enzyme complex and LAB2PRO® friendly bacteria, ensuring optimal nutrient absorption. Essential amino acids like L-Leucine, Beta Alanine, Betaine Anhydrous, and Taurine enhance the formula, further aiding in muscle repair. The comprehensive vitamin and mineral matrix in One Stop® Xtreme plays a crucial role in maintaining normal protein synthesis, immune system function, and normal testosterone production - essential for peak physical performance. With its smooth texture and superior taste of the powder, One Stop® Xtreme is not only effective but also enjoyable to consume. Available in both 2.03kg tubs (protein powder 2kg with 14 servings) and larger 4.35kg tubs (with 30 servings), Reflex's high calorie weight gain protein powder is designed to fit the needs of serious users: whether you're preparing for a competition or looking to exceed your personal bests, One Stop® Xtreme is your go-to supplement for achieving formidable results. Ingredients Whey Protein Concentrate (30 Percent) (MILK), Maltodextrin, MILK Protein (12 Percent) (of which 80 Percent Micellar Casein, 20 Percent Native Whey), OAT Flour, BARLEY Flour, Glutamine Peptides (WHEAT), Cocoa Powder, Creatine Monohydrate (Creapure), L-Leucine, Betaine Anhydrous, Beta Alanine, Flavouring, L-Taurine, Magnesium Bisglycinate, Thickener (Cellulose Gum), L-Choline Bitartrate, Digestive Enzyme Complex (DigeZyme (Alpha-Amylase, Neutral Protease, Cellulase, Lactase, Lipase)), Sweetener (Sucralose), Vitamin C (L-Ascorbic Acid), Sweetener (Steviol Glycosides), Zinc Bisglycinate, Tocotrienol-Rich Annatto Seed Extract (DeltaGold), Ferrous Bisglycinate, Protected Lactic Acid Bacteria (Bifidobacterium bifidum, Lactobacillus acidophilus, Lactobacillus rhamnosus), Vitamin B3 (Nicotinamide), Copper Bisglycinate, Selenomethionine, Piperine (BioPerine), Vitamin A (Retinyl Acetate), Vitamin B5 (Calcium D-Pantothenate), Vitamin D3 (Cholecalciferol), Vitamin B6 (Pyridoxine Hydrochloride), Vitamin B1 (Thiamine Hydrochloride), Vitamin B2 (Riboflavin), Chromium Picolinate, Vitamin B9 (Folic Acid), Vitamin B7 (D-Biotin), Vitamin B12 (Methylcobalamin). Directions Mix 145g (approximately four and a half level 60ml measures) with 400ml of water and mix thoroughly in a shaker cup or blender. On training days take one serving mid morning between meals and one serving after your workout. On non training days take two servings, one mid morning between meals and one serving in the afternoon between meals. Safety Warning This product is a food supplement and should be used in conjunction with food as part of a healthy balanced diet, not as a substitute for such. This product is not intended to diagnose, cure or prevent any disease. This product is not intended for use by persons under the age of 16. Keep out of reach of young children. Do not exceed the stated daily dose. Made in a facility which handles: Products of Crustaceans, V products of Eggs, Gluten and products of Fish. Legal Disclaimer Dietary supplements are not a substitute for a balanced and diversified diet. Box Contains 1 x 4.35kg sealed container Manufacturer Contact Information Reflex Nutrition, Sea View Way, Brighton, BN2 6NT, UK

Review: A good meal replacement, especially post workout - I think this is a very good product. It mixes nice and easy, smells good and provides sufficient calories and macro nutrient content. You'll get a good size tub for the money which I think makes it pretty good value, although if you were going to take two shakes a day, you would find it quite expensive. I personally didn't experience any stomach issues, but this is a heavy product with a lot of ingredients so some people may find they do. Obviously an item like this is designed to be taken over a long period of time so I cannot comment on its effectiveness but used correctly it would be an excellent addition to any regimen.
Review: Great taste! - I've been buying for years. Taste is the standout feature for me, non of that synthetic taste you get with other shakes. No bloating or any of that other stuff either.

## Features

- All-in-One Weight Gainer To Simplify Your Supplement Routine: One Stop Xtreme has been formulated to replace the use of numerous supplements, allowing you to take only one protein shake to support muscle growth alongside a balanced healthy diet
- High-performing Weight Gain Shake: One Stop Extreme high protein powder delivers a hit of protein, creatine, BCAAs and other beneficial nutrients to bodybuilders looking to make gains - contributing to the growth and maintenance of muscle mass
- Boosting Stregth and Endurance: Reflex mass gainer protein powder contains creatine, that increases physical performance in successive bursts of short-term, high intensity exercise - With LAB2PRO friendly bacteria and Digezyme digestive enzymes
- Nutritional Excellence: contains L-Leucine, Beta Alanine, Betaine Anhydrous and Taurine, along with essential vitamins and minerals aiding the maintenance of normal protein synthesis, function of the immune system and testosterone production
- Premium Ingredients: Reflex only uses whey protein sourced from grass-fed cows, ensuring a high-quality weight gain protein powder that mixes well, with a smooth texture and a delicious taste
- Produced in an Informed Sport Registered Facility: Suitable for vegetarians and Halal certified - Hormone-free, zero added sugars, artificial colors or soy protein, assuring a conscientious choice of food supplements for weight gain

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004LBIXFI |
| Age Range Description | Adult |
| Allergen Information | Contains: Barley, Egg may contain, Milk, Oat, Wheat |
| Benefits | Muscle Growth |
| Best Sellers Rank | 12,757 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 105 in Whey Nutrition Protein |
| Brand | Reflex |
| Brand Name | Reflex |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.4 out of 5 stars 331 Reviews |
| Diet Type | Halal |
| Diet type | Halal |
| Flavour | Chocolate Perfection |
| Global Trade Identification Number | 05033579013077 |
| Item Dimensions | 20.3 x 20.3 x 30.1 centimetres |
| Item Nype Name | HEALTH_PERSONAL_CARE |
| Item Weight | 4350 Grams |
| Item weight | 4350 Grams |
| Manufacturer | Reflex Nutrition Ltd. |
| Manufacturer Contact Information | Reflex Nutrition, Sea View Way, Brighton, BN2 6NT, UK |
| Material Type Free | Sugar Free |
| Net Content Volume | 16.34 Litres |
| Number of Items | 1 |
| Package Type Name | Tub |
| Product benefits | Muscle Growth |
| Protein Source | Whey |
| Recommended Uses For Product | During Workout |
| Supplement Formulation | Multi-Supplement |
| Unit Count | 4350.0 Grams |

## Product Details

- **Brand:** Reflex
- **Flavour:** Chocolate Perfection
- **Item weight:** 4350 Grams
- **Material Type Free:** Sugar Free
- **Diet type:** Halal
- **Product benefits:** Muscle Growth
- **Protein source:** Whey
- **Unit count:** 4350.0 gram
- **Recommended uses for product:** During Workout
- **Number of items:** 1

## Images

![Nutrition One Stop® Xtreme - Serious Mass Gainer - All in One Protein Powder - 55g Protein, 10.3g BCAAs, 5,000mg Creatine - Muscle Building Protein Shake (Chocolate Perfection, 4.35kg) - Image 1](https://m.media-amazon.com/images/I/71lKA6vjwnL.jpg)

## Available Options

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

## Questions & Answers

**Q: Why is the scoop so huge?**
A: I dont know...to save time ant put 3 scoops instead of 6 perhaps😬

**Q: is this effective as all in one supplement without having to get creatine l glutamine bcca separately?**
A: Best bulking results I’ve ever had was with this product. So yes.

**Q: How long does 1 tub (4.35kg) last?**
A: Hello I only take 1 scoop at night when I've trained so 3 times a week lasted me a good few months you don't need more than 1 small scoop

**Q: How is the vanilla ice cream flavour in terms of taste??Ive had some 'vanilla' flavours in my time that were absolutely terrible and made me gip**
A: Salaam i remember the big toughened foil bags maybe they had more powder in them.  But this one stop is brilliant good for vegetarians no bovine or gelatine in it. Personally i only use 1 scoop it's more than enough.  And in milk it tastes really nice not harsh or chemical taste. I did my research before buying it's  much better than the other brands even those charging much more than reflex. In Shaa Allah you'll get good results with this.

## Customer Reviews

### ⭐⭐⭐⭐⭐ A good meal replacement, especially post workout
*by J***N on 14 July 2025*

I think this is a very good product. It mixes nice and easy, smells good and provides sufficient calories and macro nutrient content. You'll get a good size tub for the money which I think makes it pretty good value, although if you were going to take two shakes a day, you would find it quite expensive. I personally didn't experience any stomach issues, but this is a heavy product with a lot of ingredients so some people may find they do. Obviously an item like this is designed to be taken over a long period of time so I cannot comment on its effectiveness but used correctly it would be an excellent addition to any regimen.

### ⭐⭐⭐⭐⭐ Great taste!
*by A***5 on 18 January 2026*

I've been buying for years. Taste is the standout feature for me, non of that synthetic taste you get with other shakes. No bloating or any of that other stuff either.

### ⭐⭐⭐⭐⭐ Effective
*by J***S on 23 January 2026*

Good product

## Frequently Bought Together

- Reflex Nutrition One Stop® Xtreme - Serious Mass Gainer - All in One Protein Powder - 55g Protein, 10.3g BCAAs, 5,000mg Creatine - Muscle Building Protein Shake (Chocolate Perfection, 4.35kg)
- Warrior Creatine Monohydrate Powder – Micronised for Easy Mixing and Consumption – Proven to Improve Physical Performance / Recovery, 5g Servings (Unflavoured, 300g)
- Warrior Protein Shaker Bottle, Includes Wire Mixball Blender – 600ml – Perfect for Mixing Powdered Shakes, Clear, BPA Free, Dishwasher Safe

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-02-08*