AYRTONS Epsom salt provides ONLY the pharmaceutical grade designation which is safe for human and animal use. This grade is manufactured, tested, and certified to meet the stringent regulatory standards of the U.S. Food and Drug Administration (FDA) and the United States Pharmacopeia. Magnesium Sulphate (also known as Epsom Salts) has a wide range of uses which includes: preventing obesity, laminitis, poor general condition, over-excitedness, nervousness and muscle tremors. Suitable for all-round veterinary use, this concentrated salt is a quality source of Magnesium also widely used as a laxative.