--- product_id: 555284097 title: "Rule 1 Proteins Mass Gainer, Chocolate Peanut Butter, 8 Servings" brand: "rule 1 proteins" price: "¥14153" currency: JPY in_stock: true reviews_count: 8 category: "Rule 1 Proteins" url: https://www.desertcart.jp/products/555284097-rule-1-proteins-mass-gainer-chocolate-peanut-butter-8-servings store_origin: JP region: Japan --- # Chocolate Peanut Butter flavor 40g all-whey protein with 9g BCAAs 1,220+ calories per serving Rule 1 Proteins Mass Gainer, Chocolate Peanut Butter, 8 Servings **Brand:** rule 1 proteins **Price:** ¥14153 **Availability:** ✅ In Stock ## Summary > 🚀 Elevate your bulk game with every delicious sip! ## Quick Answers - **What is this?** Rule 1 Proteins Mass Gainer, Chocolate Peanut Butter, 8 Servings by rule 1 proteins - **How much does it cost?** ¥14153 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/555284097-rule-1-proteins-mass-gainer-chocolate-peanut-butter-8-servings) ## Best For - rule 1 proteins enthusiasts ## Why This Product - Trusted rule 1 proteins brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Power-Packed Calories:** Fuel your transformation with 1,220+ calories per serving—because gains don’t wait. - • **Clean & Trusted Quality:** Crafted in GMP-certified USA facilities with zero banned substances—train with confidence. - • **Creatine-Enhanced Formula:** Pure creatine monohydrate added to amplify strength and explosive power. - • **Triple Whey Protein Boost:** 40g of premium whey protein delivering 9g BCAAs for muscle recovery and growth. - • **Optimal Carb-to-Protein Ratio:** 6:1 complex carbs to protein blend designed to maximize lean mass growth. ## Overview Rule 1 Proteins Mass Gainer is a high-calorie, chocolate peanut butter-flavored weight gain formula delivering over 1,220 calories, 250g+ complex carbs, and 40g of all-whey protein per serving. Enhanced with creatine monohydrate and produced in GMP-certified US facilities, it supports serious muscle growth and recovery for adults committed to intense training and clean nutrition. ## Description Buy Rule 1 Proteins Mass Gainer - High-Calorie Weight Gain Formula with 1,220+ Calories, 250g+ Complex Carb Blend, 40g All-Whey Protein Per Serving (8 Servings, Chocolate Peanut Butter) on desertcart.com ✓ FREE SHIPPING on qualified orders Review: Insane results - 4th or 5th time ordering this, great results. Went from a skinny 145lbs to ripped 175lbs lean muscle, no fat. Chocolate peanut butter is my go-to. It mixes incredibly easily with the Helimix vortex shaker. I use 1 scoop because the shaker can't fit 2 plus the milk required. Pro tip, if you don't like the texture of the shake, mix it in advance and put it in the fridge, it breaks down the grittiness with time. Overall 10/10. I have trouble eating enough and this really helps. It tastes good enough that I look forward to drinking a shake every day Review: Great taste and good quality… - My first ever peanut butter mass gainer and it did not disappoint. I found out that I didn’t have to used that many ingredients to have a tasteful shaker because this alone with peanut (I’m obsessed with peanut butter) and milk is all you need ## Features - Serious Weight Gainer: With over 1,220 calories, more than 250g carbohydrates, and 40g protein from three types of whey, Mass Gainer puts you in charge of transforming to XXL. - 6:1 CARB-TO-PROTEIN RATIO - The 6:1 carb-to-protein ratio in this calorie-packed formula can help you pack on desired pounds. - All-Whey Protein: 40g of high-quality whey protein delivers 9 grams of naturally occurring BCAAs per serving. - Additional Features: Enhanced with pure creatine monohydrate. - Clean Manufacturing: R1 Mass Gainer is proudly made in our own state-of-the-art GMP certified facilities in the USA and produced clean, with no banned substances. - Directions: Mix two (2) scoops of Mass Gainer with approx. 18-20 oz. of water, milk or your favorite beverage in a shaker cup or glass for a delicious shake. Or add your favorite fruit and ice to the above, mix in blender and enjoy as a smoothie! Mass Gainer should be combined with a high-calorie diet and weight training or other high-intensity exercise. Use it in conjunction with the food you normally eat for additional daily calories. Do not use in place of meals. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BJN1YN36 | | Age Range Description | Adult | | Allergen Information | Milk, Soy | | Best Sellers Rank | #15,904 in Health & Household ( See Top 100 in Health & Household ) #10 in Sports Nutrition Weight Gainers | | Brand | Rule 1 Proteins | | Brand Name | Rule 1 Proteins | | Customer Reviews | 4.5 out of 5 stars 58 Reviews | | Diet Type | Gluten Free | | Flavor | Chocolate Peanut Butter | | Item Dimensions | 8 x 8 x 11 inches | | Item Nype Name | Weight Gainer | | Item Weight | 6 Pounds | | Manufacturer | Rule One Proteins, LLC | | Manufacturer Part Number | RZ0669 | | Model Name | Mass Gainer | | Model Number | RZ0669 | | Number of Items | 1 | | Package Type Name | Bottle | | Product Benefits | Meal Replacement, Muscle Growth, Weight Gain | | Protein Source | Whey | | Recommended Uses For Product | Meal Replacement | | Servings per Container | 8 | | Total Servings Per Container | 8 | | UPC | 196671006691 | | Unit Count | 91.0 Ounce | ## Product Details - **Brand:** Rule 1 Proteins - **Flavor:** Chocolate Peanut Butter - **Item Weight:** 6 Pounds - **Recommended Uses For Product:** Meal Replacement - **Unit Count:** 91.0 Ounce ## Images ![Rule 1 Proteins Mass Gainer, Chocolate Peanut Butter, 8 Servings - Image 1](https://m.media-amazon.com/images/I/71kmMgcnJYL.jpg) ## Available Options This product comes in different **Size, Flavor** options. ## Questions & Answers **Q: What is Rule 1 Mass Gainer?** A: Mass Gainer is a nutrient-dense formula that delivers over 1,220 calories, 250g of blended carbs, and 40g of all-whey protein in every serving. **Q: When & how should I take Rule 1 Mass Gainer?** A: Use Mass Gainer longside regular meals—not as a replacement—to support your daily calorie goals. For best results, combine with a nutrient-dense diet and consistent resistance training. **Q: How do I prepare Mass Gainer?** A: Mix 2 heaping scoops of Mass Gainer with 20–24 oz. of water, milk, or your favorite beverage in a blender or large shaker cup until smooth. **Q: Is Rule 1 Mass Gainer tested for quality?** A: Yes. As an Informed Choice certified product, Mass Gainer is regularly tested for the presence of banned substances by world-class anti-doping laboratory LGC. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Insane results *by S***T on October 23, 2025* 4th or 5th time ordering this, great results. Went from a skinny 145lbs to ripped 175lbs lean muscle, no fat. Chocolate peanut butter is my go-to. It mixes incredibly easily with the Helimix vortex shaker. I use 1 scoop because the shaker can't fit 2 plus the milk required. Pro tip, if you don't like the texture of the shake, mix it in advance and put it in the fridge, it breaks down the grittiness with time. Overall 10/10. I have trouble eating enough and this really helps. It tastes good enough that I look forward to drinking a shake every day ### ⭐⭐⭐⭐⭐ Great taste and good quality… *by C***S on June 20, 2026* My first ever peanut butter mass gainer and it did not disappoint. I found out that I didn’t have to used that many ingredients to have a tasteful shaker because this alone with peanut (I’m obsessed with peanut butter) and milk is all you need ### ⭐⭐⭐⭐ MIX IN BLENDER!!! *by B***E on May 31, 2026* Would get 5 stars if it mixed well in a shaker cup! the taste is great though and the results are there! ## Frequently Bought Together - Rule One Proteins, Mass Gainer- Chocolate Peanut Butter, High-Calorie Weight Gain Formula w/ 1,220+ Calories, 250g+ Complex Carb Blend, 40g All-Whey Protein, 8g Fat Per Serving, 6 Pounds, 8 Servings - Nutricost Creatine Monohydrate Micronized Powder 500G, 5000mg Per Serv (5g) - 100 Servings, 17.9 Oz - Dymatize Super Mass Gainer Protein Powder, Rich Chocolate, 52g Protein, 1g Creatine, 1280 Calories, 10.7g BCAAs, 245g Carbs, Contains Whey Protein Powder, Isolate, and Casein, Total 8 Servings --- ## 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/555284097-rule-1-proteins-mass-gainer-chocolate-peanut-butter-8-servings](https://www.desertcart.jp/products/555284097-rule-1-proteins-mass-gainer-chocolate-peanut-butter-8-servings) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-07-05*