According to Dr Carolyn Dean M.D., N.D. in her book “The Miracle of Magnesium”, practically everyone. Particularly those with muscle/joint pain, migraine, fibromyalgia, high blood pressure, those with arthritis, osteoporosis, diabetes, restless legs syndrome, chronic fatigue, depression, anxiety, stress, heart disease, PMS, kidney stones, gout, insomnia, those who take calcium without magnesium, and those who exercise, particularly athletes.