Supplementing your horse's diet with magnesium helps to manage stress, erratic behavior, anxiety, and also helps to relax tight muscles. Prepare your horse for an event with Nupafeed Magnesium Horse Calming Concentrated Paste with MAH. MAH is a refined source of magnesium that offers exceptionally high absorption rates and increased bioavailability. This concentrated paste is a great solution to help your horse manage stress and anxiety prior to a stress-inducing event.