Vitamin D levels in liver transplantation recipients and early postoperative outcomes: Prospective observational DLiverX study

•Vitamin D has pleiotropic biological effects relevant for critically ill patients.•The majority of liver transplantation recipients have vitamin D deficiency.•Vitamin D level is inversely associated with disease severity in liver disease.•During tansplantation recipients be supplemented with vitamin D routie day 28.•Liver transplantation recipients should be supplemented with vitamin D routinely.