--- product_id: 306749193 title: "GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds" brand: "gnc" price: "¥11713" currency: JPY in_stock: false url: https://www.desertcart.jp/products/306749193-gnc-amp-mass-xxx-clinically-proven-weight-gainer-protein-powder store_origin: JP region: Japan --- # MyoTOR boosts strength in 2 weeks 50g protein per serving 780+ calories & 127g carbs fuel gains GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds **Brand:** gnc **Price:** ¥11713 **Availability:** ❌ Out of Stock ## Summary > 🚀 Fuel your gains, fast-track your strength, and own the gym grind! ## Quick Answers - **What is this?** GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds by gnc - **How much does it cost?** ¥11713 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/306749193-gnc-amp-mass-xxx-clinically-proven-weight-gainer-protein-powder) ## Best For - gnc enthusiasts ## Why This Product - Trusted gnc brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Versatile & Delicious:** 4 flavors, perfect post-workout or anytime to crush your mass gain goals. - • **Clean & Tested Formula:** Screened against 220+ banned substances for safe, elite-level performance. - • **Power-Packed Nutrition:** 50g protein, 127g carbs, and healthy fats deliver sustained energy and recovery. - • **Max Gains with Minimal Sets:** Achieve 40% more results with fewer workouts—optimize your time and effort. - • **Clinically Proven Muscle Growth:** Backed by MyoTOR, creatine & BETAPOWER for rapid strength & stamina gains. ## Overview GNC AMP Mass XXX is a clinically proven mass gainer delivering 780+ calories, 50g of high-quality protein, and 127g of carbs per serving. Featuring MyoTOR, creatine blends, and BETAPOWER, it accelerates muscle strength and endurance improvements in as little as 2 weeks. Tested against 220+ banned substances, this formula supports efficient muscle growth with 40% fewer sets, making it the go-to choice for serious athletes and fitness professionals aiming for rapid, clean mass gains. ## Description Buy GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds on desertcart.com ✓ FREE SHIPPING on qualified orders ## Features - Clinically Proven Gainer: Mass XXX mass gainer combines high-quality protein powder, key nutrients, and science-backed innovations—including MyoTOR, creatine, and BETAPOWER—to fuel proven results and performance - Increase Mass with 40% Fewer Sets: Delivers 50g of protein, including naturally occurring EAAs, plus carbs, and healthy fats—and it’s clinically proven to help get better results out of workouts - Improve Muscle Strength in As Early as 2 Weeks: MyoTOR is clinically proven to accelerate improvements in strength with as little as 2 weeks of training and included in every serving of Mass XXX mass gainer - Improve Stamina: Take resistance training to a new limit with MyoTOR’s clinically studied support for improved muscle endurance and BETAPOWER’s athletic performance benefits - Banned Substance Tested: Product was tested and monitored for over 220 banned substances on the 2020 World Anti-Doping Agency (WADA) Prohibited list via LGC skip lot testing ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B091D1L7K4 | | Age Range Description | Adult | | Best Sellers Rank | #222,167 in Health & Household ( See Top 100 in Health & Household ) #64 in Sports Nutrition Weight Gainers | | Brand | GNC | | Brand Name | GNC | | Customer Reviews | 4.7 out of 5 stars 170 Reviews | | Flavor | Vanilla | | Item Dimensions | 7.99 x 7.99 x 12.4 inches | | Item Weight | 2724 g | | Manufacturer | GNC | | Manufacturer Part Number | 123405 | | Model Number | 123405 | | Number of Items | 1 | | Package Type Name | Canister | | Product Benefits | Supports overall health and wellness by providing essential nutrients and targeted ingredients for daily vitality and specific health needs. Product Benefits Supports overall health and wellness by providing essential nutrients and targeted ingredients for daily vitality and specific health needs. See more | | Protein Source | Casein, Soy, Whey | | Recommended Uses For Product | Post-Workout | | UPC | 048107213763 | | Unit Count | 96 Ounce | ## Product Details - **Brand:** GNC - **Flavor:** Chocolate - **Item Weight:** 6.8 Pounds - **Product Benefits:** Supports overall health and wellness - **Servings per Container:** 13.0 ## Images ![GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds - Image 1](https://m.media-amazon.com/images/I/71o+j-x+0cL.jpg) ![GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds - Image 2](https://m.media-amazon.com/images/I/7182bvHyKFL.jpg) ![GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds - Image 3](https://m.media-amazon.com/images/I/610MXpqb0qL.jpg) ![GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds - Image 4](https://m.media-amazon.com/images/I/71X+lfwD05L.jpg) ![GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Vanilla, 13 Servings, 6 Pounds - Image 5](https://m.media-amazon.com/images/I/71iD5oxRqBL.jpg) ## Available Options This product comes in different **Flavor** options. ## Questions & Answers **Q: Does it help you gain weight ?** A: it helps a little. cant rely on it. food helps more obviously. ## Frequently Bought Together - GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Chocolate, 13 Servings, 6 Pounds - Optimum Nutrition Micronized Creatine Monohydrate Powder, Unflavored, 120 Servings, 600 Grams (Packaging May Vary) - Optimum Nutrition Gold Standard 100% Whey Protein Powder, Double Rich Chocolate, 5 Pound (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.jp/products/306749193-gnc-amp-mass-xxx-clinically-proven-weight-gainer-protein-powder](https://www.desertcart.jp/products/306749193-gnc-amp-mass-xxx-clinically-proven-weight-gainer-protein-powder) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-30*