--- product_id: 648954677 title: "Reflex Instant Mass Heavyweight Gainer, Chocolate, 5.4kg" brand: "reflex nutrition" price: "¥42766" currency: JPY in_stock: true category: "Reflex Nutrition" url: https://www.desertcart.jp/products/648954677-reflex-instant-mass-heavyweight-gainer-chocolate-5-4kg store_origin: JP region: Japan --- # Sustained-release carbs 1000+ kcal/serving 60g premium protein blend Reflex Instant Mass Heavyweight Gainer, Chocolate, 5.4kg **Brand:** reflex nutrition **Price:** ¥42766 **Availability:** ✅ In Stock ## Summary > 🚀 Bulk smarter, recover faster, and own every workout with Reflex Instant Mass Heavyweight! ## Quick Answers - **What is this?** Reflex Instant Mass Heavyweight Gainer, Chocolate, 5.4kg by reflex nutrition - **How much does it cost?** ¥42766 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/648954677-reflex-instant-mass-heavyweight-gainer-chocolate-5-4kg) ## Best For - reflex nutrition enthusiasts ## Why This Product - Trusted reflex nutrition brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Smart Carb Complex:** Sustained-release carbs keep your energy steady through the longest, toughest workouts. - • **Power-Packed Calories:** Fuel your gains with 1000+ calories per shake—because muscle waits for no one. - • **Quad-Source Protein Matrix:** Four premium whey proteins plus micellar casein deliver immediate and lasting muscle nourishment. - • **Creatine-Enhanced Performance:** Scientifically proven creatine boosts explosive power for high-intensity training dominance. - • **18 Essential Vitamins & Minerals:** Amplify recovery and overall health with a comprehensive micronutrient profile. ## Overview Reflex Instant Mass Heavyweight is a 5.4kg chocolate-flavored mass gainer designed for hard gainers and athletes. Each serving delivers over 1000 calories, 60g of a premium four-source whey protein blend plus micellar casein, a sustained-release carbohydrate matrix, creatine monohydrate, and 18 added vitamins and minerals. This scientifically formulated supplement supports muscle growth, sustained energy, and enhanced recovery, making it ideal for intense training and serious bulking phases. ## Description Product Description Reflex Nutrition’s Instant Mass Heavyweight protein powder is developed for hard gainers and athletes seeking a quality blend of proteins and complex carbohydrates. With over 1000 calories per shake, this bulking protein powder formula fuels your body with substantial quantities of macronutrients for building and maintaining muscle mass. Our protien blend combines four premium sources of whey protein with slow-releasing micellar casein, catering to both immediate and sustained amino acid delivery. The Whey Protein Concentrate is carefully processed to preserve its purity, while Hydrolysed Whey Protein is enzymatically treated for rapid absorption. Together with Native Whey, these form a full-spectrum protein assault that contributes effectively to muscle growth and recovery. Instant Mass Heavyweight bodybulding supplement is crafted with a multifaceted carbohydrate matrix. This intelligent carb blend sidesteps the pitfalls of simple sugars and syrups, opting instead for a sustained-release energy supply - It's the perfect partner for the long, intense workout sessions. Each serving of protein supplements is also power-packed with 18 added vitamins and minerals, amplifying the nutrition profile and supporting your body’s demands through all phases of training - whether you’re prepping, pushing through, or in post-workout recovery, Reflex's weight gain protein powder formula will help you achieve your goals. Incorporated into this mix is creatine powder, scientifically proven to increase physical performance in successive bursts of short-term, high-intensity exercise, ideal for those aiming to dominate in their sport. This high protein shake is available in two sizes to accommodate your training intensity and frequency (protein powder 2kg and protein powder 5.4kg). Choose your flavour from a variety including traditional favourites and exciting new taste profiles (vanilla protein powder, strawberry protein powder, chocolate protein powder and more). Ingredients Maltodextrin, Glutamine Peptides (WHEAT), OAT Flour, Whey Protein Concentrate (MILK), Emulsifier (SOYA Lecithin), Cocoa Powder, MILK Protein (of which 80% Micellar Casein, 20% Native Whey), Hydrolysed Whey Protein (MILK), Creatine Monohydrate (Creapure), Flavouring, L-Glutamine, Magnesium Citrate, L-Choline Bitartrate, Vitamin C (L-Ascorbic Acid), Sweetener (Sucralose), Bacillus Coagulans (LactoSpore), Zinc Bisglycinate, Vitamin E (D-Alpha Tocopherol Acetate), Selenium Enriched Yeast, Ferrous Bisglycinate, Vitamin B3 (Nicotinamide), Copper Bisglycinate, Black Pepper Extract (BioPerine Piperine), Vitamin A (Retinyl Acetate), Vitamin B5 (Calcium D-Pantothenate), Vitamin D3 (Cholecalciferol), Vitamin B6 (Pyridoxine Hydrochloride), Vitamin B2 (Riboflavin), Vitamin B1 (Thiamine Hydrochloride), 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 Instructions for use1 serving per day.. Mix 300 Safety Warning Store in a cooldry place away from direct sunlight and moisture. Do not use if the inner safety seal under the cap is broken or missing. Box Contains 1 x Instant Mass Heavyweight - 5.4kg -Chocolate Perfection Manufacturer Contact Information Reflex Nutriton, Sea View Way, Brighton, BN2 6NT, United Kingdom See more ## Features - The product contains 1538 kJ/363 - Powder for preparing shakes, versatile; taste, color, and texture may vary slightly depending on the variety. - Suitable for supplementary use as part of a varied diet – without health or function-related claims. - Stir 300 g of powder into sufficient liquid and consume as needed. The nutritional values per serving correspond to three times the values per 100 g. Taste and texture may vary slightly depending on the variety. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00KAAGU40 | | ASIN | B00KAAGU40 | | Age Range Description | Adult | | Allergen Information | Contains: Hazelnuts, Mustard, Wheat | | Benefits | Muscle Growth | | Best Sellers Rank | 2,461 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 60 in Whey Nutrition Protein | | Brand Name | Reflex Nutrition | | Country Of Origin | United Kingdom | | Country of origin | United Kingdom | | Customer Reviews | 4.1 4.1 out of 5 stars (303) | | Customer reviews | 4.1 4.1 out of 5 stars (303) | | Diet Type | Halal | | Flavour | Chocolate Perfection | | Global Trade Identification Number | 05033579001371 | | Guaranteed software updates until | unknown | | Is discontinued by manufacturer | No | | Item Dimensions | 13 x 38 x 45.5 centimetres | | Item Nype Name | HEALTH_PERSONAL_CARE | | Item Weight | 5400 Grams | | Item model number | Instant Mass Heavyweight Protein | | Manufacturer | Reflex Nutrition | | Manufacturer | Reflex Nutrition | | Manufacturer Contact Information | Reflex Nutriton, Sea View Way, Brighton, BN2 6NT, United Kingdom | | Manufacturer Part Number | 100076540030 | | Material Type Free | Caffeine Free, GMO Free | | Model Name | Reflex Nutrition Instant Mass Heavyweight | Mass Protein Powder | | Model Number | Instant Mass Heavyweight Protein | | Number of Items | 1 | | Package Type Name | Tub | | Product Dimensions | 13 x 38 x 45.5 cm; 5.4 kg | | Protein | 60 g | | Protein Source | Whey | | Recommended Uses For Product | Post-Workout | | Supplement Formulation | Multi-Supplement | | Unit Count | 1.0 gram | ## Product Details - **Brand:** Reflex Nutrition - **Diet type:** Halal - **Flavour:** Chocolate Perfection - **Item weight:** 5400 Grams - **Material Type Free:** Caffeine Free, GMO Free - **Number of items:** 1 - **Product benefits:** Muscle Growth - **Protein source:** Whey - **Recommended uses for product:** Post-Workout - **Unit count:** 1.0 gram ## Images ![Reflex Instant Mass Heavyweight Gainer, Chocolate, 5.4kg - Image 1](https://m.media-amazon.com/images/I/71QvAT6USTL.jpg) ## Available Options This product comes in different **Size, Flavor** options. ## Questions & Answers **Q: Why isnt the nutritional info shown?!** A: The company sent me only half my order on multiple occasions and the wrong flavour. The fact that the nutritional info isnton there is no surprise **Q: how well does this mix in an ordinary shaker? i know some are clumpy and chalky tasting, thank you** A: Hi I would recommend blend for 7 seconds if that. If you have a good shaker and give it a good shake it will be just as smooth great mix chocolate for me taste wonderful **Q: Has it got any. Bcaa,s pls** A: Finished it a long time ago so don’t have the package. But i checked the photos and googled the BCAA’s and based on this, the product doesn’t have any of the 9 essential amino acids aka BCAA. So it’s a No and you’ll have to buy it separately. **Q: Good afternoon. is this the original reflex supplement. why is there a big difference in the price. why on amazon it is soo much cheaper** A: Good afternoon So basically if you want to sell something on a website like Amazon your price should be lower then the price you might sell individually by yourself, plus, Amazon and similar websites make profit by the quantity of the products being sold not individually that’s why they can break the price that low cause obviously they buy it for a low price in mass quantities. Even with the suppliers if you make a deal to buy a good amount of their products, you can get a good discount. ## Frequently Bought Together - Reflex Nutrition Instant Mass Heavyweight - Mass Gainer - Over 1000 Kcal per Serving, 60g Protein, Creatine - High Calorie Post Workout or Before Bed Protein Shake (Chocolate Perfection, 5.4 kg) - Warrior Protein Shaker Bottle, Includes Wire Mixball Blender – 600ml – Perfect for Mixing Powdered Shakes, Clear, BPA Free, Dishwasher Safe - Bulk Iconic Shaker Bottle, 750ml, Clear, Leak-Proof, BPA-Free, Wire Mixing Ball for Lump-Free Shakes, Convenient Carry Handle, Transparent Fill Level, Dishwasher Safe --- ## 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.jp/products/648954677-reflex-instant-mass-heavyweight-gainer-chocolate-5-4kg](https://www.desertcart.jp/products/648954677-reflex-instant-mass-heavyweight-gainer-chocolate-5-4kg) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-10*