premium quality Magnesium is a vital mineral that plays a number of important functions in the body including: Reduction of Tiredness and Fatigue. Muscle Function Magnesium helps to maintain normal muscle function. It also contributes to normal protein synthesis and has a role in cell division, two processes which are involved in muscle development. contributes to normal psychological function. and magnesium also contributes to the normal functioning of the nervous system and helps to maintain normal bones and teeth