After oxygen, water and basic food, magnesium may be the most important element your body needs. Magnesium activates over 300 different bodily processes, including digestion, energy production, bone formation, creation of new cells (pregnancy), activation of B vitamins, relaxation of muscles, as well as assisting in the functions of the heart, kidneys, adrenals, brain and nervous system. Lack of sufficient available magnesium in the body can interfere with any or all of these processes.