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 (Salted Caramel, 4.35kg)

Price: £82.99
(as of Dec 10, 2025 08:36:02 UTC – Details)


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.
Package Dimensions ‏ : ‎ 31.8 x 22.9 x 22.9 cm; 4.35 kg
Manufacturer ‏ : ‎ Reflex Nutrition
ASIN ‏ : ‎ B09JL91ZTJ
Item model number ‏ : ‎ REF131
Country of origin ‏ : ‎ United Kingdom
Customer reviews: 4.4 4.4 out of 5 stars (313) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
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