You are in Medical Library . Definition Magnesium is a mineral that is essential in the daily diet.
Most dietary magnesium comes from vegetables, particularly dark-green leafy vegetables.
Functions Magnesium has several important metabolic functions. It plays a role in the production and transport of energy. It is important in the contraction and relaxation of muscles. It is involved in the synthesis of protein , and it assists in the functioning of certain enzymes in the body. Magnesium excess almost always occurs only when magnesium is supplemented as a medication.