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BIG ROCK NUTRITION XXX Mass Gainer has been formulated with a higher carb to protein ratio to assist Bodybuilders and other hardcore athletes to optimize their mass gaining potential. Designed to stimulate the anabolic hormone insulin, Mass Gainer drives anabolic and anti-catabolic nutrients into the muscle cell. which optimizes gains in muscle size and strength while accelerating post-workout recovery. XXX Mass Gainer is an Incredible tasty mass gainer specially formulated to pack size into even the hardest gainers.