What is Bio-Magnesium? Magnesium is an essential dietary mineral; although the human body contains a relatively small amount (approximately 25g, 60% of which is in the skeleton), magnesium plays a vital role in the normal functioning of the body. The best dietary sources of magnesium are green leafy vegetables and cereals. Many individuals may not have an adequate intake of magnesium, because of their reliance on processed foods which contain little magnesium. Magnesium used in supplements may occur in several chemical forms; magnesium oxide is the least expensive but is poorly absorbed, magnesium citrate is the form most readily absorbed, whilst magnesium sulphate and magnesium gluconate are least likely to cause digestive system upset. What does Bio-Magnesium do? Magnesium is a versatile mineral involved in over 300 enzyme-catalysed metabolic reactions essential for normal functioning of the body. In particular, magnesium is important for maintaining a healthy cardiovascular system, and healthy nerves and muscles. Magnesium is also important for strong bone and tooth formation, and normal skeletal development, as well as supporting normal blood clotting and the production of the body\'s energy supply.