Magnesium is often referred to as The Missing Mineral as studies have found that a large percentage of the population are deficient in this essential nutrient. However, it plays a crucial role in over 300 enzymatic reactions in the body, therefore supplementation may be required. NaturesPlus Magnesium Capsules deliver 400 mg of natural, essential magnesium in highly bioavailable citrate form. Suitable for daytime or nighttime use.