Natural Factors Magnesium Citrate provides 150 mg per capsule in a 180 capsule bottle to support healthy muscle and heart function. The highly absorbable citrate form aids enzyme reactions, protein synthesis, carbohydrate metabolism, and calcium and potassium absorption. Non GMO and lab tested, these easy to swallow capsules are free of artificial colors, preservatives, gluten, soy, dairy, and other common allergens.