Can you use magnesium for dietary supplement?

Yes. Magnesium is important. It is involved in over 300 chemical reactions including muscle, nerve, immune system, heart and bone functions. Adult men need up to 420 mg/day, with younger men, women and children needing less. There is plenty in foods like cereal, nuts, beans, and spinach, so a supplement may not be needed. More info: http://ods.Od.Nih.Gov/factsheets/magnesium-healthprofessional/.