I just looked up Mg on WebMD. Unfortunately it could cause diarrhea. Sheesh. I sure don't need that! And I don't really understand why my doctor says I need to take it because we get it from fiber-rich fruits and dark green leafy veggies which I eat every day. At any rate, WebMD verifies its many uses in addition to constipation - bad cholesterol, heart disease, and sure enough - problems affecting the functioning of our nerves and brain!!!
.... from WebMD:
attention deficit-hyperactivity disorder (ADHD), anxiety, chronic fatigue syndrome (CFS), Lyme disease, fibromyalgia, leg cramps during pregnancy, diabetes, kidney stones, migraine headaches, weak bones (osteoporosis), premenstrual syndrome (PMS), altitude sickness, urinary incontinence, restless leg syndrome, asthma, hayfever, multiple sclerosis, and for preventing hearing loss.