I was told by my cardiologist totake magnesium. He said "just take the store brand or whatever." Well, Iwas in one of the MAJOR stores, and asked the pharmacist ASSISTANT why none was on the shelves. She found some behind the counter that reads MAGNESUM OXIDE 400 mg tablets. She asked the pharmiasist if it was ok, and she said yes. i wish i hadn't bought it now. LENNIN... please respond.. I read another posts of yours that says not to take this . If it says "Oxide." I don't think you meant it was dangerous or anything. It was only 6.15 for 120 tablets, so I'm not out much money. What do you al think? What is a bottle of Magnesium supposed to say??