--- product_id: 249603014 title: "(ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Chocolate, 6 Lbs (2.72 KG)" brand: "optimum nutrition" price: "¥18996" currency: JPY in_stock: true reviews_count: 13 category: "Optimum Nutrition" url: https://www.desertcart.jp/products/249603014-on-serious-mass-high-protein-muscle-building-and-weight-gainer store_origin: JP region: Japan --- # 25 Vitamins & Minerals + Creatine boost 50g Blended Protein for muscle recovery 1,250 Calories per serving (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Chocolate, 6 Lbs (2.72 KG) **Brand:** optimum nutrition **Price:** ¥18996 **Availability:** ✅ In Stock ## Summary > 💥 Bulk Up Smart: Serious Mass for Serious Gains! ## Quick Answers - **What is this?** (ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Chocolate, 6 Lbs (2.72 KG) by optimum nutrition - **How much does it cost?** ¥18996 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/249603014-on-serious-mass-high-protein-muscle-building-and-weight-gainer) ## 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 - • **Clean Carb Surge:** Over 250g of carbohydrates with zero added sugar for sustained energy without the crash. - • **Calorie Powerhouse:** Fuel your gains with a massive 1,250 calories per serving—because size matters. - • **Recovery Amplifiers:** Enhanced with Creatine, Glutamine, and Glutamic Acid to maximize post-workout recovery. - • **Immune-Boosting Essentials:** Infused with Vitamin C, Zinc, and Vitamin D to keep your defenses strong while you bulk. - • **Protein-Packed Performance:** 50 grams of premium blended protein to accelerate muscle repair and growth. ## Overview Optimum Nutrition Serious Mass is a high-calorie, high-protein weight gainer designed for adults seeking rapid muscle and mass growth. Each 6 lb container delivers 1,250 calories, 50 grams of blended protein, and over 250 grams of carbs per serving, enriched with 25 essential vitamins and minerals plus recovery-boosting creatine and amino acids. Perfect for post-workout or between meals, this vegetarian-friendly chocolate-flavored formula supports muscle recovery, immune health, and sustained energy without added sugars. ## Description Product Description Serious Mass is the ultimate in weight gain formulas. With 1,250 calories per serving and 50 grams of protein for muscle recovery support, this instantized powder makes the ideal post-workout and between meals shake for sizing up your goals. Serious Mass provides you with the tools you need to pack on the pounds and help you develop the physique you’ve always wanted. Set Contains: 1 x Pack Review: Highly recommended - Awesome product Review: Perfect value for money - perfect value for money ## Features - Adding Calories Has Never Been This Easy or Tasted So Good - 1,250 Calories - 50 Grams of Blended Protein & 25 Vitamins and Essential Minerals - Over 250 Grams of Carbohydrates with NO ADDED SUGAR - Creatine, Glutamine and Glutamic Acid ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B06XH28C1K | | Age Range Description | Adult | | Best Sellers Rank | #2,935 in Health ( See Top 100 in Health ) #146 in Sports Supplements | | Brand | Optimum Nutrition | | Brand Name | Optimum Nutrition | | Country of Publication | USA | | Customer Reviews | 4.1 out of 5 stars 304 Reviews | | Diet Type | Vegetarian | | Diet type | Vegetarian | | Flavor | Chocolate | | Flavour | Chocolate | | Item Dimensions | 8 x 4 x 6 centimeters | | Item Nype Name | HEALTH_PERSONAL_CARE | | Item Weight | 0.27 Kilograms | | Item weight | 0.27 Kilograms | | Manufacturer | Optimum Nutrition | | Manufacturer Part Number | SERIOUS MASS CHOCOLATE 6lbs | | Material Type Free | Finished Product | | Material type free | Finished Product | | Model Number | SERIOUS MASS CHOCOLATE 6lbs | | Number of Items | 1 | | Package Type Name | Bottle | | Product Benefits | High Calorie, High Protein formula for Muscle and Mass Gain Support | | Servings per container | 8 | | Total Servings Per Container | 8 | | UPC | 748927022995 748927070132 | | Unit Count | 2720 Grams | ## Product Details - **Brand:** Optimum Nutrition - **Flavour:** Chocolate - **Item weight:** 2.72 Kilograms - **Material type free:** Finished Product - **Servings per container:** 8 ## Images ![(ON) Serious Mass: High Protein Muscle Building & Weight Gainer Protein Powder, 50 Grams of Protein, Vitamin C, Zinc And Vitamin D For Immune Support - Chocolate, 6 Lbs (2.72 KG) - Image 1](https://m.media-amazon.com/images/I/71qpIQW5NlL.jpg) ## Available Options This product comes in different **Size, Flavor** options. ## Questions & Answers **Q: Can I need one kg** A: Dear Valued Customer, I hope this message finds you well. We wanted to inform you that Optimum Serious Mass in the 1 kg variant is currently not in production by the company. However, we do have the following options available: Optimum Nutrition (ON) Serious Mass: Chocolate, 12 Lbs (5.44 KG) Optimum Nutrition (ON) Serious Mass: Chocolate, 6lb (2.73 KG) Thank You! **Q: When the date of expiry?** A: 1 year ahead is the minimum requirement of all nutritional stuff in Amazone **Q: Is there a version of this product without creatine?** A: Hi, This product contains Creatine. There is no version of this product without creatine. **Q: What is the expiry date ?** A: October/2022 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Highly recommended *by K***F on 3 May 2025* Awesome product ### ⭐⭐⭐⭐⭐ Perfect value for money *by M***A on 11 August 2024* perfect value for money ### ⭐⭐⭐⭐ Good product *by A***E on 29 March 2026* one of the best muscle building protein ## Frequently Bought Together - OPTIMUM NUTRITION Serious Mass Chocolate No Sugar Added, 272.1 g - Optimum Nutrition Gold Standard Whey Protein, Muscle Building Powder with Naturally Occurring Glutamine and Amino Acids, Double Rich Chocolate, 29 Servings, 899 g, Packaging May Vary - Optimum Nutrition Micronised Creatine Powder, 100% Pure Creatine Monohydrate Powder for Performance and Muscle Power, Unflavoured Shake, 93 Servings, 317 g --- ## 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/249603014-on-serious-mass-high-protein-muscle-building-and-weight-gainer](https://www.desertcart.jp/products/249603014-on-serious-mass-high-protein-muscle-building-and-weight-gainer) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-06*