I'm fully aware of the magneisum research and also that it is intracellular magnesium - not blood levels - that are needed to truly see if a person is magnesium deficit ( a very strong cause of arrhythmia). Also PPIs deplete magnesium. I disagree about caffeine . I look at the science. YES, it causes palpitations in many people but not everyone and cardiologists are surprised that multiple studies show coffee is not the factor they thought it was in inducing a-fib. The explanation is, perhaps, that based on genetic differences, people metabolize caffeine different. Of course, perfectly health young people have DIED from mammoth ingestion of caffeine in supplements and sports drinks. But it is not accurate to claim that nobody should or could drink caffeine if they have arrhythmia. Of course, there's nothing wrong in erring on the side of caution. Here's an interesting article on the subject (an editorial with footnotes to research, published in the European Journal of Preventive Cardiology last year): https://journals.sagepub.com/doi/full/10.1177/2047487318778650?url_ver=Z39.88-2003&rfr_id=ori%3Arid%3Acrossref.org&rfr_dat=cr_pub%3Dpubmed