--- product_id: 1047483 title: "Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate, 12 Pound (Packaging May Vary)" brand: "optimum nutrition" price: "R4058" currency: ZAR in_stock: true reviews_count: 12 category: "Optimum Nutrition" url: https://www.desertcart.co.za/products/1047483-serious-mass-weight-gainer-protein-powder-mass-gainer-vitamin-c store_origin: ZA region: South Africa --- # 250g+ carbs per serving 50g blended protein 1200+ kcal/serving Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate, 12 Pound (Packaging May Vary) **Brand:** optimum nutrition **Price:** R4058 **Availability:** ✅ In Stock ## Summary > 🚀 Bulk smarter, not harder with Serious Mass! ## Quick Answers - **What is this?** Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate, 12 Pound (Packaging May Vary) by optimum nutrition - **How much does it cost?** R4058 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/1047483-serious-mass-weight-gainer-protein-powder-mass-gainer-vitamin-c) ## 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 2-scoop serving—perfect for fast metabolisms and serious bulkers. - • **Immune Support Formula:** Enhanced with Vitamin C and Zinc to keep your defenses strong while you push your limits. - • **Carb-Loaded Energy Boost:** Over 250 grams of carbohydrates to replenish glycogen and keep your energy levels maxed out. - • **Customizable Shake Experience:** Blend with fruits, nuts, or peanut butter for a delicious, calorie-dense shake tailored to your goals. - • **Muscle-Building Protein Blend:** 50 grams of premium whey protein to support lean muscle growth and recovery after every workout. ## Overview Serious Mass by Optimum Nutrition is a high-calorie weight gainer delivering over 1,200 calories, 50g of blended whey protein, and 250g+ carbohydrates per 2-scoop serving. Enhanced with 20+ vitamins and minerals including immune-boosting Vitamin C and Zinc, plus creatine for muscle support, it’s designed for adults aiming to increase muscle mass and overall weight. Ideal for post-workout or between meals, this chocolate-flavored powder blends best with a blender and offers versatile mix-in options to maximize your calorie intake and muscle growth. ## 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. Review: It helps a lot - Optimum Nutrition Serious Mass is a great choice for anyone looking to gain weight, build muscle, or increase overall calorie intake. The Chocolate flavor mixes smoothly—especially if you use a blender—and has a rich, dessert-like taste without being overly sweet. Each serving delivers a very high amount of calories, protein, and carbs, which makes it ideal for people with fast metabolisms or those who struggle to eat enough throughout the day. It also includes added vitamins, minerals, and creatine for extra support. The bag is large and lasts a good amount of time depending on how much you use. The powder is heavy, so mixing by hand can be a bit difficult, but blending solves that problem easily. Overall, Serious Mass is effective for healthy weight gain and muscle-building goals. If you need a calorie boost and don’t mind a thick shake, it’s a solid and reliable product. Review: Serious Mass - I’ve only gotten this product yesterday but so far I’m happy with it. Mixes fairly well in a protein blender bottle, chocolate flavor tastes smooth, and almost 700 calories per scoop. I mix it with lactaid milk and water and my body hasn’t had a problem with digesting. ## Features - HIGH CALORIE WEIGHT GAINER: More than 1,200 calories per 2-scoop serving - 50 grams of blended protein per 2-scoop serving - Over 250 grams of carbohydrates per 2-scoop serving - With over 20 vitamins and minerals including Vitamin C and Zinc to provide immune support - MORE VERSATILITY: Using an electric blender, add fresh or frozen fruits, peanut butter, nuts, and other calorie dense foods to boost your weight gain potential ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000GIPJ0M | | ASIN | B000GIPJ0M | | Age Range Description | Adult | | Allergen Information | Milk, Soy | | Best Sellers Rank | #1,223 in Health & Household ( See Top 100 in Health & Household ) #1 in Sports Nutrition Weight Gainers #139 in Sales & Deals | | Brand Name | Optimum Nutrition | | Customer Reviews | 4.5 4.5 out of 5 stars (34,339) | | Date First Available | September 16, 2003 | | Department | unisex-adult | | Diet Type | Vegetarian | | Flavor | Chocolate | | Global Trade Identification Number | 00748927023800 | | Is Discontinued By Manufacturer | No | | Item Dimensions | 11.5 x 5.5 x 16 inches | | Item Weight | 12 Pounds | | Item model number | 1101529 | | Manufacturer | Glanbia Performance Nutrition | | Manufacturer | Glanbia Performance Nutrition | | Manufacturer Part Number | 1101529 | | Material Type Free | Caffeine Free | | Model Name | ON SERIOUS MASS CHOCOLATE 12LB | | Model Number | 1101529 | | Net Content Volume | 13.88 Liters | | Number of Items | 1 | | Package Type Name | Tub | | Product Benefits | Immune Support, Muscle Growth, Weight Gain | | Product Dimensions | 11.5 x 5.5 x 16 inches; 12 Pounds | | Protein | 50 Grams | | Protein Source | Whey | | Recommended Uses For Product | Calorie Increase, Muscle Growth, Post-Workout, Weight Gain | | Supplement Formulation | Multi-Supplement | | Total Servings Per Container | 16 | | UPC | 748927023800 748927063592 | | Unit Count | 192.0 Ounce | | Vitamins And Minerals | 0.9, 3.7, 30, 5, 700 Milligrams, 100, 100, 1560, 410, 44, 59, 80 Percent Daily Value | ## Product Details - **Brand:** Optimum Nutrition - **Flavor:** Chocolate - **Item Weight:** 12 Pounds - **Material Type Free:** Caffeine Free - **Servings per Container:** 16 ## Images ![Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate, 12 Pound (Packaging May Vary) - Image 1](https://m.media-amazon.com/images/I/71HjvVnPj5L.jpg) ## Available Options This product comes in different **Size, Flavor** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ It helps a lot *by K***S on December 7, 2025* Optimum Nutrition Serious Mass is a great choice for anyone looking to gain weight, build muscle, or increase overall calorie intake. The Chocolate flavor mixes smoothly—especially if you use a blender—and has a rich, dessert-like taste without being overly sweet. Each serving delivers a very high amount of calories, protein, and carbs, which makes it ideal for people with fast metabolisms or those who struggle to eat enough throughout the day. It also includes added vitamins, minerals, and creatine for extra support. The bag is large and lasts a good amount of time depending on how much you use. The powder is heavy, so mixing by hand can be a bit difficult, but blending solves that problem easily. Overall, Serious Mass is effective for healthy weight gain and muscle-building goals. If you need a calorie boost and don’t mind a thick shake, it’s a solid and reliable product. ### ⭐⭐⭐⭐⭐ Serious Mass *by R***Y on April 18, 2026* I’ve only gotten this product yesterday but so far I’m happy with it. Mixes fairly well in a protein blender bottle, chocolate flavor tastes smooth, and almost 700 calories per scoop. I mix it with lactaid milk and water and my body hasn’t had a problem with digesting. ### ⭐⭐⭐⭐⭐ Solid weight gainer – works great and tastes good! *by A***N on September 15, 2025* I’ve been using Serious Mass for a few weeks now, and it's been super helpful for adding extra calories to my day. I’ve always had a hard time gaining weight, and this makes it way easier to get in the calories and protein I need without feeling like I’m constantly eating. The chocolate flavor is actually really good—especially when you blend it with milk, peanut butter, or a banana. Just a heads-up, the serving size is huge (like, 2 giant scoops), so a blender is a must. Don’t even try mixing it with a shaker bottle. I also like that it includes creatine and some vitamins, which saves me from buying those separately. Only downside is it can feel a little heavy if you’re not used to big shakes, so I started with half a serving and worked my way up. But overall, it’s been awesome for helping me bulk up. I’m already seeing some gains. ## Frequently Bought Together - Optimum Nutrition Serious Mass, Weight Gainer Protein Powder with Creatine - Nutricost Creatine Monohydrate Micronized Powder 500G, 5000mg Per Serv (5g) - 100 Servings, 17.9 Oz - 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.co.za/products/1047483-serious-mass-weight-gainer-protein-powder-mass-gainer-vitamin-c](https://www.desertcart.co.za/products/1047483-serious-mass-weight-gainer-protein-powder-mass-gainer-vitamin-c) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-04-25*