Custodio G, et al. - Herein, the correlation between vitamin D and cytokine levels were determined by comparing vitamin D serum levels in brain-dead individuals vs critically ill patients without brain death (BD). Both groups of patients exhibited similarly low serum levels of vitamin D. Furthermore, correlation of vitamin D serum levels with plasma interleukin-8, interleukin-10 and interferon-γ was noted in brain-dead patients.