Rule 1 Mass Gainer 5.64LB – 1,220+ Calories, 40g All-Whey Protein, 250g+ Complex Carbs, Creatine, MCTs and Glutamine
Rule 1 Proteins R1 Mass Gainer is one of the most calorie-dense and comprehensively formulated mass gainers in the Sports One weight gainer range. Each full serving delivers more than 1,220 calories, over 250g of complex carbohydrates, 40g of all-whey protein from three whey sources, 9g of naturally occurring BCAAs, 1g of creatine monohydrate, MCTs (Medium Chain Triglycerides), and L-Glutamine. The 5.64LB container provides approximately eight full servings. In addition, the formula carries Informed Choice certification, confirming independent testing for banned substances. Rule 1 also manufactures every batch in its own GMP-certified facility in the USA. Sports One offers this product as part of its weight gainer range in Pakistan.
The 6:1 carbohydrate-to-protein ratio and the 1,220+ calories per serving define this formula. Unlike moderate mass gainers, R1 Mass Gainer focuses on athletes with high energy expenditure and fast metabolisms. These users often struggle to create the calorie surplus required for muscle growth through food alone. When mixed with water, each serving supplies more than 1,220 calories. When mixed with whole milk, it provides approximately 1,400+ calories. As a result, one serving can supply more than half of the daily maintenance calories for many moderately active adults. Therefore, athletes who need maximum calorie intake can use it as an effective mass-building tool. However, athletes looking for a moderate option with around 550–600 calories per serving may prefer the Sanaxium Anabolic Mass range available at Sports One.
Why This Product
Rule 1 Proteins manufactures all products in its own state-of-the-art GMP-certified facility using premium globally sourced ingredients, and every batch is rigorously tested for banned substances and certified by Informed Choice. Within the Sports One weight gainer range, R1 Mass Gainer carries the most comprehensive quality certification credentials of any mass gainer in the range: Informed Choice banned substance testing covers every production batch, GMP manufacturing is in Rule 1’s own facility (not a third-party contract manufacturer), and the all-whey protein commitment means no cheaper protein sources (soy, caseinate, or plant protein) are used to inflate the gram count. For athletes who want the highest caloric density alongside the strongest quality assurance in the Sports One mass gainer range, R1 Mass Gainer is the specifically appropriate choice.
Who Should Use It
- Extreme hard gainers and ectomorphs who consistently fail to gain weight even at high food intake and want the most calorie-dense single-serving mass gainer available at Sports One
- Athletes in a deliberate off-season mass phase who want 1,220+ calories per serving to rapidly achieve and maintain a large daily caloric surplus
- Those who specifically require an Informed Choice certified mass gainer — particularly athletes in drug-tested competitive sport who need a banned substance tested mass gainer
- Bodybuilders and powerlifters in the heaviest size phases who need caloric intakes of 4,000-5,000+ calories per day where a single 1,220+ calorie serving is a practical necessity
Complete Your Stack
R1 Mass Gainer already includes 1g of creatine monohydrate per serving. For athletes who want the full 3-5g daily creatine maintenance dose, a standalone creatine supplement on all days (training and rest) covers the clinical threshold beyond the 1g in the Mass Gainer. A pre workout supplement in Pakistan on training days drives the session intensity that the 1,220+ calories support recovery from. A vitamin supplement in Pakistan covers the micronutrient demands of intensive mass-phase training beyond the protein and caloric focus of the Mass Gainer formula.









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