Mag Vet by Hypona is an all-natural magnesium supplement for horses. It helps to gently calm nervous, hot or young horses. A horse's magnesium and calcium levels can become unbalanced during stressful situations. This imbalance causes calcium levels to rise, resulting in nervousness and overexcitement. Mag Vet restores your horse's natural magnesium/calcium levels keeping them calm. Mag Vet is non-doping and is safe for competition.