My husband has Coronary Artery Disease. He takes lots of supplements, has a good diet now, exercises 7 days a week and gets Chelation Treatments regularly. When Uni-key came out with Mag-Key, I knew that it would be an excellent product for him. We had tried many other brands of magnesium in the past, but most of them worked too much like a laxative. Now, I can give him 600 to 800 mgs. of Mag-Key a day, along with the Male Multiple, and know that he is getting the right magnesium that his heart needs. I take it too, and just recently tried it in the night when I wake up and can't go back to sleep, as Dr. Gittleman recommended. 2 capsules relaxed me so much that I went back to sleep fairly quickly. If I get tense or nervous during the day, 1 or 2 capsules really calms me down. I could never absorb most other brands of magnesium and they didn't seem to do anything for me. I will never be without my Mag-Key!