Natures Plus Magnesium Capsules 120. Offering all the benefits of magnesium in an easy-to-take capsule.. With 400mg of magnesium in highly bioavailable citrate form. Previously called KalmAssure.. Directions. Take 3 capsules daily. Ingredients. Magnesium citrate, vegetable cellulose, bulking agent (microcrystalline cellulose), lubricant (magnesium stearate) and anti-caking agent (silica)