R1 Mass GainerR1 Mass Gainer by Rule One Proteins is a high calorie supplement formulated for individuals aiming to increase muscle mass and size. Each serving delivers over 1,220 calories, combining more than 250 grams of carbohydrates with 40 grams of protein sourced from a blend of whey concentrate, isolate, and hydrolysate. This 6: 1 carbohydrate to protein ratio is designed to support rapid weight gain and muscle recovery. The formula is enhanced with
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