Free Delivery. Magnesium Citrate 1900mg. Magnesium Citrate is one of the most absorbably forms of magnesium. It is an essential mineral that plays a key role in supporting cardiovascular health, and maintaining healthy muscle contraction, and easing cramps. Magnesium encourages the development and maintainance of healthy bones and teeth, making it especially essential during pregnancy, breast feeding, and for post menopausal women. It also helps provide support for women during their menstrual cycles and those undergoing premenstrual syndrome (PMS).