A fib is caused by magnesium deficiency. So are low levels of vit D. Some people are taking very high doses of D because they can’t get their levels up but their levels won’t go up until they start taking the right kind and right amount of mag.
My a-fib was caused by a low (still within normal) potassium level coupled with the stress of major surgery. There are various reasons for it to occur. Sometimes the body asserts its independance and does what it wants.
Which would be what (kind and amount)??