Vitamin D is a hormone involved in bone mineral metabolism. [1] The hormone has many extraskeletal effects as well. [2, 3] It has multiple immunomodulatory properties, [2] it is involved in glucose metabolism, as it has been proved that it improves glucose metabolism in diabetes mellitus[3] and has a protective role against cardiovascular disease. [4] In this issue of the Journal, in an article the relationship of vitamin D with kidney disease is meticulously reviewed...