The R1 Mass Gainer by Rule1 is a high-quality dietary supplement for building muscle mass and gaining weight. A whopping 40g of protein and a calorie bomb await you in one serving. The powder dissolves easily and has a mild taste. Perfect for athletes, bodybuilders, or people with high calorie needs who want to supplement their diet, R1 Mass Gainer helps support muscle building and achieve a positive calorie balance. With a variety of flavors, there is something for everyone.