RULE 1 MASS GAINER (R1 MASS GAINER) Putting on size requires a consistent caloric surplus. For most people training hard, the biggest barrier to mass gain isn't effort in the gym — it's getting enough food in every single day. R1 Mass Gainer by Rule 1 Proteins is built around that reality. At 1,260 calories and 254g of carbohydrates per 325g serve, it delivers a genuine mass-building caloric hit in a single shake, designed to bridge the gap between what hard gainers need and what they're realistically eating. This is Rule 1 doing what they do across their entire range — keeping the formula clean and effective without the usual mass gainer shortcuts. No soy protein to pad out the protein yield, no creamers, no amino spiking, and no banned substances. The protein comes exclusively from whey, and the carbohydrate system is built from a three-source blend rather than a single cheap starch. It's a mass gainer that respects the intelligence of the people using it. The carbohydrate blend The carbohydrate matrix in R1 Mass Gainer draws from three sources, each contributing something different to the overall energy and digestive profile of the formula. Maltodextrin is the primary fast-release carbohydrate — a highly branched glucose polymer that digests rapidly to spike insulin and replenish glycogen quickly. It's the workhorse of the carb blend, providing the bulk of the energy density that makes 1,260 calories per serve possible in a practical format. Organic Rice Bran adds a whole-food carbohydrate component that comes with naturally occurring fibre, vitamins, and minerals alongside its starch content. It contributes to the 7g of dietary fibre per serve and helps moderate the digestion rate relative to maltodextrin alone. Carb10™ (Pea Starch) is a patented pea-derived starch that digests more slowly than standard starches, producing a lower glycaemic response and helping to sustain energy levels over a longer period. It also has minimal osmolality, meaning it sits easier in the stomach than many high-carbohydrate formulas — a meaningful advantage when you're already consuming a very large serve. Together, the three-source system provides 254g of carbohydrates per serve with a more varied digestion profile than a single-starch formula, and with the fibre contribution of rice bran helping to round out the nutritional picture. The protein blend The 40g of protein per serve comes from the same three-source whey system used across the Rule 1 range — Whey Protein Concentrate, Whey Protein Isolate, and Whey Protein Hydrolysate. This provides both the immediate amino acid availability of hydrolysate and the sustained release characteristics of concentrate, all from 100% whey sources with no soy protein included. Creatine Monohydrate (1g) Each serve includes 1g of creatine monohydrate — a practical addition that supports ATP regeneration, strength output, and muscle cell volumisation. While 1g is a modest dose relative to a standalone creatine supplement, it contributes meaningfully to daily creatine intake for those using R1 Mass Gainer as a regular part of their bulk protocol. Per serve (325g): 1,260 calories 254g total carbohydrates (7g dietary fibre, 14g total sugars, 10g added sugars) 40g protein 8g fat (4g saturated) 1g creatine monohydrate 360mg calcium 350mg sodium 1,240mg potassium Key features: 1,260 calories per serve from a clean formula 6:1 carbohydrate-to-protein ratio Three-source carbohydrate blend including Carb10™ pea starch 40g protein from WPC, WPI, and Hydrolysate — no soy protein 1g creatine monohydrate per serve No creamers, no amino spiking, no banned substances Available in 6lb and 12lb sizes Contains milk and soy Flavours available: Chocolate Fudge, Vanilla Creme, Chocolate Peanut Butter, Cookies & Creme, Strawberries & Creme Who is it for? R1 Mass Gainer is for genuine hard gainers — people with fast metabolisms who struggle to maintain a caloric surplus through food alone, and anyone in an intentional bulking phase who needs a reliable, high-calorie supplement to consistently hit their daily targets. The clean formulation with no soy protein or banned substances also makes it a viable choice for athletes who care about what goes into a product this size. It is not a lean protein supplement and is not suited to those looking to manage caloric intake — this is a mass tool for people who need the calories. Directions: Mix two heaped scoops (325g) with water or milk in a blender or large shaker. Consume between meals or post-workout to support daily caloric intake. Do not use as a sole source of nutrition. Always read the label and use only as directed. Warning: Not suitable for children under 15 years of age or pregnant women. Should only be used under medical or dietetic supervision. This product is not a sole source of nutrition and should be consumed in conjunction with a nutritious diet and an appropriate training or exercise programme. Contains milk and soy.
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