--- product_id: 47941572 title: "Optimum Nutrition Serious Mass Protein Powder, 2.73 kg 8 Servings | Strawberry, High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Supports Muscle Building" brand: "optimum nutrition" price: "¥28180" currency: JPY in_stock: true reviews_count: 13 url: https://www.desertcart.jp/products/47941572-optimum-nutrition-serious-mass-protein-powder-2-73-kg-8 store_origin: JP region: Japan --- # 3g creatine for power 50g protein muscle boost 1250+ CAL per serving Optimum Nutrition Serious Mass Protein Powder, 2.73 kg 8 Servings | Strawberry, High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Supports Muscle Building **Brand:** optimum nutrition **Price:** ¥28180 **Availability:** ✅ In Stock ## Summary > 🚀 Elevate your mass game—because serious gains wait for no one. ## Quick Answers - **What is this?** Optimum Nutrition Serious Mass Protein Powder, 2.73 kg 8 Servings | Strawberry, High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Supports Muscle Building by optimum nutrition - **How much does it cost?** ¥28180 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/47941572-optimum-nutrition-serious-mass-protein-powder-2-73-kg-8) ## 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 high-intensity 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 support serious muscle development. - • **Vitamin & Mineral Boost:** 25 essential vitamins and minerals to keep your body optimized and recovery on point. - • **Flavor Variety for Every Palate:** Six crave-worthy flavors to keep your post-workout ritual exciting and delicious. ## Overview Optimum Nutrition Serious Mass is a high-calorie weight gainer protein powder delivering over 1250 calories, 50g of protein, and 3g of creatine per serving. Enriched with 25 essential vitamins and minerals and low in fat, it supports muscle growth, recovery, and performance. Available in six flavors, it’s designed for athletes and fitness enthusiasts aiming for rapid mass gain and enhanced workout results. ## 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 Maltodextrin, WHEY Protein Concentrate [MILK], Calcium CASEINATE [MILK], Creatine Monohydrate, Flavourings, MILK Mineral Complex, Medium Chain Triglycerides [MILK], EGG Albumen, Dipotassium Phosphate, Colour (Beetroot Red), Sodium Chloride, Vitamin & Mineral Blend (Sodium L-Ascorbate, Ferric Pyrophosphate, D-Alpha-Tocopheryl Acetate, Nicotinamide, Zinc Oxide, Retinyl Acetate, Calcium D-Pantothenate, Sodium Fluoride, Manganese Sulphate, Potassium Iodate, Cyanocobalamin, D-Biotin, Chromium (III) Chloride, Pteroylmonoglutamic Acid, Cholecalciferol, Sodium Selenite, Cupric Citrate, Pyridoxine Hydrochloride, Thiamine Hydrochloride, Phylloquinone, Riboflavin, Sodium Molybdate), Glutamine Peptides [WHEAT GLUTEN], L-Glutamine, Magnesium Oxide, WHEY Powder [MILK], Inositol, L-Ascorbic Acid, Sweetener (Sucralose), Antioxidant (Tocopherol-Rich Extract), Calcium D-Pantothenate, Pteroylmonoglutamic Acid. 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 Between Meals: Drink 1/2-1 serving of Serious Mass between meal to support a high-calorie diet. Post- Workout: Drink 1/2-1 serving of Serious Mass 30-45 minutes following exercise. Before Bed: Drink 1/2-1 serving of Serious Mass about 45-60 minutes before bed to provide nutrients to musle throughout the night. Suggested Use: For healthy adults consume enough energy from a combination of high quality fooods and supplements throughout the day as part of a balanced diet and exercise programme. Safety Warning Always reseal after use, keep in cool dry place. Legal Disclaimer Food supplements should not be used as a substitute for a varied diet. Do not exceed stated recommended daily dose. Keep out of reach of young children. Storage : Always reseal after use, keep in a cool dry place. Allergen information: Contains gluten, egg, milk May contain: peanuts, soy, nuts Manufacturer Contact Information 4 Waterside, Dublin 24, Ireland See more ## 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 | B0015R36XU | | Country Of Origin | United Kingdom | | Guaranteed Software Updates Until | unknown | | Is Discontinued By Manufacturer | No | | Item Model Number | 1031919 | | Manufacturer | OPTIG | | Product Dimensions | 20.32 x 20.32 x 25.7 cm; 2.73 kg | ## Product Details - **Brand:** Optimum Nutrition - **Diet type:** Vegetarian - **Flavour:** Strawberry - **Item weight:** 2.73 Kilograms - **Material Type Free:** Sugar Free - **Number of items:** 1 - **Product benefits:** Weight Gain - **Recommended uses for product:** Post-Workout, Pre-Workout - **Servings per container:** 8 - **Unit count:** 2730.0 gram ## Images ![Optimum Nutrition Serious Mass Protein Powder, 2.73 kg 8 Servings | Strawberry, High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Supports Muscle Building - Image 1](https://m.media-amazon.com/images/I/71tvNSNts5L.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 ### ⭐⭐⭐⭐⭐ Taste is good love it 😊 *by on Reviewed in the United Kingdom 1 June 2026* Always good never have a problems gain mass easy ❗️‼️ ### ⭐⭐⭐⭐⭐ Perfect blend of everything *by on Reviewed in the United Kingdom 8 April 2026* A wonderful product, strawberry mixes perfectly and produces results. Contains high protein and carbohydrate content but as a bonus, creatine too!If you take the recommended dosage, it wont last long, but isnt the most expensive around (review for tub).Rating is based on taste, mixing and results. ### ⭐⭐⭐⭐ Lovely *by on Reviewed in the United Kingdom 29 March 2026* Love this stuff. Taste great mixes well.Seen results on the scales adding this to the diet.Just a shame on the price. But saying that the cheaper ones are cheaper for a reason ## Frequently Bought Together - Optimum Nutrition Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Strawberry, 6 Pound (Packaging May Vary) - Optimum Nutrition Micronized Creatine Monohydrate Powder, Unflavored, 60 Servings, 300 Grams (Packaging May Vary) - VELOMIX -2 Pack- 28 oz Protein Shaker Bottles for Protein Mixes - 2x Wire Whisk | Leak Proof Shaker Cups for Protein Shakes | Protein Shaker Bottle Pack | Shakers for Protein Shakes-Black&Transparent --- ## 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/47941572-optimum-nutrition-serious-mass-protein-powder-2-73-kg-8](https://www.desertcart.jp/products/47941572-optimum-nutrition-serious-mass-protein-powder-2-73-kg-8) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-23*