Wang Y, Zheng Y, Chen P, et al. - In chronic kidney disease (CKD) patients at different stages, serum concentrations of 9 vitamins were measured simultaneously for the first time ever, and it was unveiled that all patients exhibited vitamin D deficiency and a weak correlation was identified between vitamin A or vitamin D and estimated glomerular filtration rate.

• As per accumulating evidence, there are vital roles of vitamins in CKD progression.

• A cross-sectional study of patients with CKD at stage 1–5.

• Serum levels of 9 vitamins, vitamin A, B1, B2, B6, B9, B12, C, D, and E were recorded.

• Median levels of vitamin A, B1, B2, B6, B9, B12, C and E were found to be within the reference ranges or on the borderline.

• The major comorbidities included hypertension, diabetes mellitus, and atherosclerosis.