Jhee JH, et al. - From 2008 to 2015, researchers obtained data from the Korean NHANES, a nationwide population-based cross-sectional study, to examine the relationship between renal hyperfiltration (RHF)—defined as estimated glomerular filtration rate with residual in the > 95th percentile after adjustment for age, sex, height, weight, and history of hypertension or diabetes—and vitamin D status in a relatively healthy population. The study sample consisted of 33,210 participants with normal renal function. According to findings, severe vitamin D deficiency (serum 25-hydroxyvitamin D concentration < 10 ng/mL) was significantly correlated with the increasing prevalence of RHF.