--- product_id: 18548319 title: "Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate Peanut Butter, 12 Pound (Packaging May Vary)" brand: "optimum nutrition" price: "R4581" currency: ZAR in_stock: true reviews_count: 9 category: "Optimum Nutrition" url: https://www.desertcart.co.za/products/18548319-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 Peanut Butter, 12 Pound (Packaging May Vary) **Brand:** optimum nutrition **Price:** R4581 **Availability:** ✅ In Stock ## Summary > 🚀 Bulk up like a boss with Serious Mass—because average gains are so last season. ## Quick Answers - **What is this?** Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate Peanut Butter, 12 Pound (Packaging May Vary) by optimum nutrition - **How much does it cost?** R4581 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/18548319-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 - • **Carb Overload:** 250 grams of carbs to supercharge energy and bulk up faster. - • **Protein Punch:** 50 grams of premium blended protein to amplify muscle growth and recovery. - • **Customizable Fuel:** Blend with fruits, nuts, or peanut butter for a personalized calorie explosion. - • **Calorie Powerhouse:** Fuel your gains with 1,200+ calories per 2-scoop serving—because size matters. - • **Immune Boost Formula:** Packed with Vitamin C & Zinc to keep your defenses strong while you grow. ## Overview Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering over 1,200 calories, 50g of blended protein, and 250g of carbohydrates per 2-scoop serving. Enhanced with 20+ vitamins and minerals including immune-supporting Vitamin C and Zinc, it’s designed for serious muscle growth and weight gain. Perfect for post-workout or between meals, it offers versatile blending options to maximize your calorie intake and fuel your bulk-up journey. ## 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: lives up to its name - Serious Mass really lives up to its name. If you’re looking to put on size, this is one of the easiest ways to get a huge calorie and protein boost in one shake.. The taste is solid (I’ve tried Chocolate and Vanilla), though it’s definitely thick — I usually blend mine with milk or add a banana/peanut butter to make it smoother. It’s filling, so I don’t use it every day, but on heavy training days it’s perfect. The bag is big and lasts a while, though it can be a bit pricey. Overall, a great option if you’re serious about bulking and need extra calories. Review: Great Taste and Ingredients - Tastes good, good ingredients, price is amazing. Good amount of calories per serving which is exactly what I need when the GLP-1s make me not hungry. ## Features - HIGH CALORIE WEIGHT GAINER: More than 1,200 calories per 2-scoop serving - 50 grams of blended protein per 2-scoop serving - 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 | B00OV0VYHI | | ASIN | B00OV0VYHI | | Age Range Description | Adult | | Allergen Information | Milk, Soy | | Best Sellers Rank | #1,272 in Health & Household ( See Top 100 in Health & Household ) #1 in Sports Nutrition Weight Gainers #152 in Sales & Deals | | Brand Name | Optimum Nutrition | | Caffeine Content Description | Caffeine Free | | Customer Reviews | 4.6 4.6 out of 5 stars (4,916) | | Date First Available | December 18, 2013 | | Diet Type | Vegetarian | | Flavor | Chocolate Peanut Butter | | Global Trade Identification Number | 00748927052572 | | Is Discontinued By Manufacturer | No | | Item Dimensions | 11.5 x 5.5 x 16 inches | | Item Weight | 12 Pounds | | Item model number | 1056371 | | Manufacturer | Glanbia Performance Nutrition | | Manufacturer | Glanbia Performance Nutrition | | Manufacturer Part Number | 1056371 | | Material Type Free | Caffeine Free | | Model Name | ON SERIOUS MASS CHOC PB 12LB | | Model Number | 1056371 | | 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 | 748927052572 | | Unit Count | 192.0 Ounce | | Vitamins And Minerals | 0.9, 3.7, 30, 5, 700 Milligrams | ## Product Details - **Brand:** Optimum Nutrition - **Flavor:** Chocolate Peanut Butter - **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 Peanut Butter, 12 Pound (Packaging May Vary) - Image 1](https://m.media-amazon.com/images/I/511yjH27xML.jpg) ## Available Options This product comes in different **Size, Flavor** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ lives up to its name *by K***K on December 14, 2025* Serious Mass really lives up to its name. If you’re looking to put on size, this is one of the easiest ways to get a huge calorie and protein boost in one shake.. The taste is solid (I’ve tried Chocolate and Vanilla), though it’s definitely thick — I usually blend mine with milk or add a banana/peanut butter to make it smoother. It’s filling, so I don’t use it every day, but on heavy training days it’s perfect. The bag is big and lasts a while, though it can be a bit pricey. Overall, a great option if you’re serious about bulking and need extra calories. ### ⭐⭐⭐⭐⭐ Great Taste and Ingredients *by M***Y on March 20, 2026* Tastes good, good ingredients, price is amazing. Good amount of calories per serving which is exactly what I need when the GLP-1s make me not hungry. ### ⭐⭐⭐⭐⭐ Perfect protein *by J***L on November 12, 2025* Love this mass gainer, it’s helped me gain weight through my fitness journey. Tastes good and isn’t hard to dissolve ## Frequently Bought Together - Optimum Nutrition Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate Peanut Butter, 12 Pound (Packaging May Vary) - Optimum Nutrition Micronized Creatine Monohydrate Powder, Unflavored, 120 Servings, 600 Grams (Packaging May Vary) --- ## 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/18548319-serious-mass-weight-gainer-protein-powder-mass-gainer-vitamin-c](https://www.desertcart.co.za/products/18548319-serious-mass-weight-gainer-protein-powder-mass-gainer-vitamin-c) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-04-25*