MagCalm is a unique calming food supplement based on easily absorbable complex chelated (protein bound) magnesium and potassium. Together, these ingredients help muscles work more effectively and promote calm behaviour. Magnesium is commonly deficient in many diets and pastures and is a very effective calmer. Magnesium is known to help maintain healthy muscles, calm behaviour and soothe nerves. Suitable for all horses and ponies.