NAF Magic Powder is a magnesium calmer with a difference. It's a five-star formula that contains a unique combination of herbs and nutrients known to help relax muscle tissue and support concentration. Magnesium is an essential nutrient to a horse’s wellbeing, and among its many roles in the regulation of nervous tension. As magnesium also acts on muscle tension, a horse low in magnesium may appear ‘tight’ in his way of going and express excitability or a lack of confidence. Low magnesium may be caused by a grazing deficiency or simply a horse or pony’s individual metabolism. Magnesium levels can also be reduced by regular travel and competition.