HorseFlex L-lysine RefillHorseFlex L Lysine Refill is just the thing to help support your horse's immune system and overall well being. This clever supplement is packed with L Lysine, an essential amino acid that horses can't produce themselves. Your horse needs to get it through their diet, and that's where we come in! Boosts Immunity L Lysine plays a key role in promoting a strong immune system and enhancing your horse's resistance to all those pesky bugs. Perfect for