I've had Atrial Fibrillation since I was 20. I'm 32 now and it runs in my family. Dad and 2 brothers have it.
I stay away from caffeine and take the Caffeine Free N.O. Xplode 2.0. Like AWARCORP said, 3 weeks on, 2 weeks off. I have not had any issues yet, but I'm only on my 2nd cycle.