VDR and cardiac arrhythmia: Another cardioprotective mechanism of vitamin D involves regulation of calcium metabolism in cardiac cells, crucial for myocardial contractility and arrhythmia prevention [6].Studies in murine cardiomyocytes have demonstrated both genomic and non-genomic effects, highlighting the critical role of the vitamin D receptor (VDR), particularly localized in cardiac T-tubules, in maintaining myocardial function [8].