@713j Magnesium Glycinate, 200 mg. daily. I have had only a few "episodes" of A-fib since I was diagnosed a little over a year ago. I avoid alcohol, drink 1/2 caf coffee (that is one thing I just could not give up), limit any chocolate, lost weight and exercise every day. I am scheduled for an ablation in 14 days, but who is counting! 🙂 I just want to feel reasonably "normal" again. Good luck.