NPPB and heart failure: In this regard, the effects of monthlyvitamin D supplementation at 100,000 IU on high sensitivity cardiac troponin I(hs-c Tn1), troponin T (hs-cTnT), and N-terminal-pro-B-type natriuretic peptide(NT-proBNP), as established biomarkers for heart failure in a post-hoc analysishave been examined.