Had bad heart arrythmia last 3 years. Afib three times. Last resort I started taking calcium/magnesium supplements 400mg magnesium per day. Within 4 hours my arrythmia stopped. I've had perfect sinus heart rythm for 4 months now. Take it every day. Gold label. Calcium Magnesium with vitamin D3. Feel like a kid again. Best thing I've ever done. No more cardioversions. No ablations.(which was next) Told the cardiologist and he seemed disinterested. Can't believe he would put his profits above someone's health and quality of life. Not a doctor and not an expert, but I'm telling you it's true!