Karma Rub Magnesium Sport Spray is fast and effective. Restore your muscles daily with a few sprays. Magnesium may relax muscles, nerves & tendons. Topical magnesium is applied to the skin and readily absorbed within minutes. Karma Rub (TM) Magnesium Sport Spray is 100% natural, 100% Australian and contains high levels of magnesium chloride. Topical magnesium may relax and rejuvenate your body’s tired and sore muscles as well as boost your body’s mineral content.