--- product_id: 2576114 title: "Serious Mass Weight Gainer Protein Powder, Chocolate, 6LB" brand: "optimum nutrition" price: "¥27976" currency: JPY in_stock: true category: "Optimum Nutrition" url: https://www.desertcart.jp/products/2576114-serious-mass-weight-gainer-protein-powder-chocolate-6lb store_origin: JP region: Japan --- # 250g+ carbs for energy 50g premium protein blend 1200+ calories/serving Serious Mass Weight Gainer Protein Powder, Chocolate, 6LB **Brand:** optimum nutrition **Price:** ¥27976 **Availability:** ✅ In Stock ## Summary > 🏋️‍♂️ Bulk smarter, not harder with Serious Mass! ## Quick Answers - **What is this?** Serious Mass Weight Gainer Protein Powder, Chocolate, 6LB by optimum nutrition - **How much does it cost?** ¥27976 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/2576114-serious-mass-weight-gainer-protein-powder-chocolate-6lb) ## 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 - • **Calorie Powerhouse:** Fuel your gains with 1,200+ calories per serving—because size waits for no one. - • **Endless Energy Boost:** 250+ grams of carbs to replenish glycogen and keep you crushing workouts all day. - • **Muscle Repair Master:** 50 grams of high-quality whey protein to accelerate recovery and build lean muscle. - • **Nutrient-Rich Formula:** 20+ essential vitamins & minerals including Vitamin C and Zinc for immune and overall health support. - • **Customizable Shake Builder:** Mix with your favorite calorie-dense add-ins to tailor your mass gain journey your way. ## Overview Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering over 1,200 calories, 50g of premium whey protein, and 250g+ carbohydrates per serving. Enhanced with 20+ vitamins and minerals, it supports muscle growth, recovery, and immune health. Perfect for professionals committed to serious bulking and sustained energy, this easy-mix formula lets you customize your shake to fit your unique mass gain goals. ## Description More calories. More protein. More carbs. SERIOUS MASS by Optimum Nutrition serves over 1,200 calories, 50g of blended protein, and over 249g of carbohydrates per 2-scoop serving to help you maximize your daily caloric intake – the ideal post-workout and between meals shake for sizing up your goals. SERIOUS MASS provides you with more tools to help you pack on pounds, when taken in addition to normal calorie intake and over time with regular resistance training ## Features - HIGH-CALORIE MASS GAINER FOR SIZE & STRENGTH:Delivers over 1,200 calories per 2-scoop serving to support weight gain, bulking phases, and increased daily energy intake when diet alone isn’t enough - 50G PREMIUM PROTEIN BLEND: Provides 50 grams of blended protein per serving to help support muscle repair, recovery, and lean mass development after intense training - HIGH-CARB ENERGY SUPPORT: Packed with over 250 grams of carbohydrates per serving to replenish glycogen stores, fuel workouts, and support sustained energy throughout the day - ADDED VITAMINS & MINERALS FOR DAILY NUTRITION: Includes 20+ essential vitamins and minerals, including Vitamin C and Zinc, to help support overall nutritional balance and immune system function - CUSTOMIZABLE, HIGH-CALORIE SHAKE BUILDER: Easily blend with milk, fruits, peanut butter, nuts, or other calorie-dense ingredients to further increase calories, improve taste, and tailor your weight-gain goals - Optimum Nutrition is the World's #1 Sports Nutrition Brand- Highest quality control measures so you feel comfortable and safe consuming the product ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0015R36SK | | ASIN | B0015R36SK | | Age Range Description | Adult | | Allergen Information | Milk, Soy | | Best Sellers Rank | #1,880 in Health & Household ( See Top 100 in Health & Household ) #2 in Sports Nutrition Weight Gainers #246 in Sales & Deals | | Brand Name | Optimum Nutrition | | Customer Reviews | 4.5 4.5 out of 5 stars (34,653) | | Date First Available | May 7, 2005 | | Department | unisex-adult | | Diet Type | Vegetarian | | Flavor | Chocolate | | Item Dimensions | 6.14 x 6.14 x 9.76 inches | | Item Weight | 0.9 kg | | Item model number | 1101537 | | Manufacturer | Glanbia Performance Nutrition | | Manufacturer | Glanbia Performance Nutrition | | Manufacturer Part Number | 1101537 | | Material Type Free | Caffeine Free | | Model Name | ON SERIOUS MASS CHOCOLATE 6LB | | Model Number | 1101537 | | Number of Items | 1 | | Package Type Name | Tub | | Product Benefits | Immune Support, Muscle Growth, Weight Gain | | Product Dimensions | 6.14 x 6.14 x 9.76 inches; 1.98 pounds | | Protein | 50 g | | Protein Source | Whey | | Recommended Uses For Product | Calorie Increase, Muscle Growth, Post-Workout, Weight Gain | | Supplement Formulation | Multi-Supplement | | Total Servings Per Container | 8 | | UPC | 748927022995 | | Unit Count | 96 Ounce | | Vitamins And Minerals | 0.9, 3.7, 30.0, 5.0, 700.0 milligrams, 410, 80 milligrams | ## Product Details - **Brand:** Optimum Nutrition - **Flavor:** Chocolate - **Item Weight:** 0.9 kg - **Material Type Free:** Caffeine Free - **Servings per Container:** 8 ## Images ![Serious Mass Weight Gainer Protein Powder, Chocolate, 6LB - Image 1](https://m.media-amazon.com/images/I/71n54LdwKfL.jpg) ## Available Options This product comes in different **Size, Flavor** options. ## Questions & Answers **Q: How well does this work? I'm a teen with a high matabalizum and I'm looking to build mass and bulk up** A: I’m nearly 50 years old, but seeing this question I had to comment. Until I was around 32 or so, I couldn’t gain weight no matter how much I had to eat; or so it seemed. I remember not caring whether it was fat or ideally muscle, I just didn’t want to be skinny anymore. Then I hit a point in my life where the metabolism slowed and I couldn’t keep the weight off. That lasted for nearly 15 years and for some reason my appetite suddenly plummeted and now I’m back looking at weight gainers simply to do nothing more than maintain a healthy weight. Just try to keep in mind that human physiology typically prohibits putting on large amounts of muscle in a short period of time naturally. That means that a large portion of quick gains will be fat. Embrace your high metabolism and shoot for a reasonable goal. That said, the more calories you intake in a day that exceeds what your body can burn, the quicker you will gain weight. For the most part, it’s simple math. Total Intake - Total Burned = Energy Stored Primarily as Fat. There are about 3500 calories in one pound. If you were to forge an extra 3500 calories a day, you could theoretically gain 7 pounds a week. For someone like you, that probably means eating 8,000 calories a day. Now as far as this product goes, it’s one of the highest calorie per serving gainers I have seen and it’s much quicker to pound a shake than to eat a steak! Another thing to keep in mind is that supplements that are fortified with vitamins and minerals, have the potential to far exceed recommended safe values for human consumption. I ran into this when I was your age. I was drinking over a gallon of milk a day, milk is fortified with vitamin D and that build up led to some freaky painful headaches in me personally. Too much calcium can also upset your bodies homeostasis and lead to surprising problems. Being young, your body can handle a lot! Just wanted you to be aware of the things I wish I knew when I was your age. If I were young again I would focus on speed, agility and good clean ripped muscle! Shredded muscle always looks bigger than fat muscle. Cheers! **Q: banana** A: I’m adding my two cents. Chocolate peanut butter is the truth. Banana was good at first, and then it wasn’t. **Q: Does it work without work out ?because im so busy all day** A: First off, I am so sorry that everyone that responded to this question this far hasn't answered your question. I'm seeing you ask if this helps you put on weight without working out. I've seen 3 or 4 people put "no excuses, no short cuts," "no motivation, no nothing" and other meat head answers. I apologize about them =) Getting to your question. Yes, it does help you gain weight even if you're not working out. I understand you're busy...who's not? Working out and drinking this is without question the best way to gain weight. But, for the last 2 weeks I've been drinking a scoop in the morning, and a scoop at night before bed. And I've gained 3 pounds! Doesn't sound like a lot, but if I don't get 6 eggs every morning, I'll loose 2 pounds. If I don't eat 400 calories everyday, I'll loose 2 pounds. I have such a low fat to muscle ratio that if I type it in, people won't believe me, so ill save it for the haters on YouTube (jk) 😅 But yeah, this stuff works. Might jist be a pounds a week, but if you're like me, that's great success. This does work without working out as long as you drink it consistently. Best of luck to you my friend. **Q: will a high intensity sport like basketball plus weight training, 5 days a week lessen the effectiveness of this product??** A: The guy who says this causes cancer is lying or is just ignirant. Some other supplements may but even at that mant studies don't say which ones. Powder prorein supplements do not. As do many men, i don't use this product for muscle gain. I use max muscle for that. I use this for belly fat gaining. ## Frequently Bought Together - Optimum Nutrition Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate, 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/2576114-serious-mass-weight-gainer-protein-powder-chocolate-6lb](https://www.desertcart.jp/products/2576114-serious-mass-weight-gainer-protein-powder-chocolate-6lb) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-01*