I take 400 mg dr Sinatra, hoping that’s a safe level, which I think it is.

Hi, Teresa @hopeful33250. I don't take a magnesium supplement product, but rely on a half dozen foods for my daily intake: First, is almond butter for lunch, then oats for breakfast along with yogurt, and dark chocolate for snacks. Other good sources for me are sesame seeds, quinoa, and avacado. I avoid leafy greens for their vitamin K component which conflicts with my Coumadin anticoagulant. Martin

Some magnesium absorbs better than others. Looking online, we discovered that Magnesium Glycinate 400mg absorbs the best. Might go up in dosage and take two. Also, Hawthorne root capsules from health food stores/Whole Foods is suppose to be good for the heart. I took it for about a week, but went on Metoprolol and will introduce it to my system as I get use to the Metoprolol to slow the heart beat. My beat is better. I am grateful there are so many ways we can approach these problems of the heart, and many complement each other. Day 2 of Metoprolol. I had some tightness in the neck and chest yesterday which cleared up in 15 minutes. Getting use to it. As far as dosage of vitamins, I think you just have to wing it. Do some research, consider your age, size, sensativity etc. I've been taking vitamins since my mid 20's when I read Adelle Davis' books. I consider them food. Also, my husband and I prepare 95% of our food from scratch, fresh soups, fresh steamed vegs, fresh berries with oatmeal etc. I think having simple, low sodium and low sugar food really matters.