MAG SELECT is our new daily supplement pellet containing 5000 mg. of Magnesium per feeding. Magnesium helps maintain normal nerve and muscle function, supports a healthy immune system, keeps the heartbeat steady, and helps bones remain strong. Starting with our popular OXY-GEN 2X as a base, MAG SELECT adds a magnesium polysaccharide complex for maximum bioavailability of this essential mineral for your horse.