Formula 303 is a natural muscle relaxant combining Valerian Root Extract, Passion Flower (Passiflora), and Magnesium in a precise blend. This vegetarian formula, trusted since the 1960s, delivers a potent dose with six parts Valerian Root (quad strength), three parts Passiflora, and one part Magnesium Carbonate. It is safe, effective, non-habit forming, and has no known side effects. *Please note it may have a characteristic odor.