--- product_id: 402455023 title: "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 (Blueberry, 4.35kg)" brand: "reflex" price: "€ 210.71" currency: EUR in_stock: true reviews_count: 13 category: "Reflex" url: https://www.desertcart.hr/products/402455023-reflex-nutrition-one-stop-xtreme-serious-mass-gainer-all-in store_origin: HR region: Croatia --- # 5,000mg Creapure® Creatine 55g Protein per serving 10.3g BCAAs for muscle repair 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 (Blueberry, 4.35kg) **Brand:** reflex **Price:** € 210.71 **Availability:** ✅ In Stock ## Summary > 🔥 Bulk smarter, recover faster, and own your gains with One Stop® Xtreme! ## Quick Answers - **What is this?** 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 (Blueberry, 4.35kg) by reflex - **How much does it cost?** € 210.71 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/402455023-reflex-nutrition-one-stop-xtreme-serious-mass-gainer-all-in) ## 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, creatine, BCAAs & more. - • **Muscle Growth Maximizer:** 55g premium whey protein from grass-fed cows fuels serious gains and recovery. - • **Clean & Certified Quality:** Halal, vegetarian, hormone-free, zero added sugars, made in Informed Sport registered facility. - • **Endurance & Strength Boost:** 5,000mg Creapure® creatine enhances high-intensity workout performance. - • **Optimized Absorption Formula:** Digezyme® enzymes + LAB2PRO® friendly bacteria ensure maximum nutrient uptake. ## 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. Free from added sugars, artificial colors, and hormones, it’s Halal certified and suitable for vegetarians, making it a clean, convenient, and effective choice for anyone committed to maximizing muscle gains and recovery. ## 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%) (MILK), maltodextrin, MILK protein (12% (of which 80% micellar casein, 20% native whey)), OAT flour, BARLEY flour, glutamine peptides (WHEAT), creatine monohydrate (creapure), L-leucine, flavouring, betaine anhydrous, beta alanine, L-taurine, magnesium bisglycinate, colours (betanin, anthocyanin), thickener (cellulose gum), L-choline bitartrate, sweeteners (sucralose, steviol glycosides from stevia), digestive enzyme complex (DigeZyme (alpha-amylase, neutral protease, cellulase, lactase, lipase)), vitamin C (L-ascorbic acid), zinc bisglycinate, vitamin E (D-alpha tocopherol acetate), selenium enriched yeast, ferrous bisglycinate, vitamin B3 (nicotinamide), copper bisglycinate, piperine (BioPerine), protected lactic acid bacteria (bifidobacterium bifidum, lactobacillus acidophilus, lactobacillus rhamnosus), 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) P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Directions Mix 145 g (approximately one level 250ml measure) with 600 ml water until powder has fully dissolved. Take a shake mid-morning between meals, and a second shake after your workout if required. Safety Warning This product is a food supplement and should be used in conjunction with food as part of a healthy and varied diet, not as a substitute for such. Recommended daily consumption is one to two 145 g servings per day. Do not exceed the stated recommended daily dose. This product is not intended for use by persons under the age of 18. Keep out of reach of young children. The scoop included with this product measures by volume not by weight, for precise measurements please use measuring scales. This product is sold by weight, not by number of servings. Protein contributes to the growth and maintenance of muscle mass. Creatine increases physical performance in successive bursts of short-term, high intensity exercise. The beneficial effect is obtained with a daily intake of 3 g of creatine. Manufacturer Contact Information Reflex Nutrition, Sea View Way, Brighton, BN2 6NT, UK See more 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 | B09JL8FPX4 | | ASIN | B09JL8FPX4 | | Age Range Description | Adult | | Allergen Information | Contains: Hazelnuts, Milk, Mustard | | Best Sellers Rank | 9,003 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 89 in Protein Nutrition Blends | | Brand | Reflex | | Country of origin | United Kingdom | | Country of origin | United Kingdom | | Customer Reviews | 4.4 4.4 out of 5 stars (331) | | Customer reviews | 4.4 4.4 out of 5 stars (331) | | Date First Available | 15 Oct. 2021 | | Format | Powder | | Item model number | One Stop Xtreme | | Manufacturer | Reflex Nutrition | | Manufacturer contact | Reflex Nutrition, Sea View Way, Brighton, BN2 6NT, UK | | Package Dimensions | 31.7 x 22.8 x 22.6 cm; 4.35 kg | | Units | 4350.0 Grams | ## Product Details - **Brand:** Reflex - **Diet type:** Halal - **Flavour:** Blueberry - **Item weight:** 4350 Grams - **Material Type Free:** Sugar Free - **Number of items:** 1 - **Product benefits:** Muscle Growth - **Protein source:** Whey - **Recommended uses for product:** Post-Workout - **Unit count:** 4350.0 Grams ## Images ![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 (Blueberry, 4.35kg) - Image 1](https://m.media-amazon.com/images/I/71243JVCCBL.jpg) ## Available Options This product comes in different **Size, Flavor** options. ## 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 (Blueberry, 4.35kg) - Reflex Nutrition Zinc Matrix - Magnesium, Zinc, Vitamin B6, Boron & Copper Supplement - Fatigue and Tiredness Supplements - Normal Muscle Function - Support Metabolism and Immune System (100 Capsules) - Reflex Nutrition Creapure® Creatine Monohydrate Capsules - Performance Enhancing Creatine Tablets for Strength, Muscle Gains & Recovery (90 Creatine Capsules, 45 Servings - 700mg Creatine Monohydrate) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/402455023-reflex-nutrition-one-stop-xtreme-serious-mass-gainer-all-in](https://www.desertcart.hr/products/402455023-reflex-nutrition-one-stop-xtreme-serious-mass-gainer-all-in) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-15*