My mother has atrial fib and is 87 years old and is doing well on taking a magnesium supplement 100mg, CO enzyme 10 - 100 mg and Calcium tables twice a day. She is on a low dose beta blocker and a blood thinner as well. Her sister is 88 years old and on the same medications and vitamins listed above with atrial fib and still uses a bicycle to get around in Germany. In addition, I found a yoga exercise used for cardiac problems that is supposed to help reverse atrial fib. The exercise is to cover your left nostril of your nose with a finger of your left hand and slowly release any air in your lungs. Then switch to close the right nostril with the same left finger and breath in slowly with your left nostril for a count of 5-7 secs, then alternate and let the air out of the right nostril - continue to do this for about 10 tries. And try to do this on a daily basis or when stressed.