Rule 1 Mass Gainer

Rule 1 Proteins' High-Calorie Weight Gainer

With over 1,220 calories, 250g of blended carbs, and 40g of all-whey protein in every serving, Mass Gainer is designed to fuel fast metabolisms and help hard gainers add mass.*

Calories, Protein, & More

Building mass requires consuming more calories than are burned, and quality mass demands attention to the nutritional composition of those calories. Mass Gainer delivers the complete package with premium all-whey proteins for recovery, fast-digesting carbs for energy, and creatine monohydrate to support size and strength gains.^

Anytime Formula

Mass Gainer should be used alongside regular meals—not as a replacement—to support daily calorie goals. For best results, combine with a nutrient-dense diet and consistent resistance training.

Clean Manufacturing & Quality

Mass Gainer is crafted in Rule 1's state-of-the-art, GMP-certified facility in the USA using premium globally sourced ingredients. It's rigorously tested for banned substances and certified by Informed Choice.

About The Brand

Rule 1 Proteins is more than just a supplement brand. With over a decade of experience in sports nutrition, Rule 1 manufactures all products in its state-of-the-art facility using premium globally sourced ingredients to deliver consistent, top-quality results in every scoop. No shortcuts, no compromises—just products designed to help athletes and fitness enthusiasts perform at their best.