In a genome-wide association (GWA) study, Gezen-Ak et al. indicated a relationship between low serum levels of 25(OH)D and PD, identifying several polymorphisms in vitamin D receptor (VDR) genes that correlate with different degrees of severity in Parkinson’s in relation to serum levels of 25(OH)D [86]. Here, VDR is linked to Parkinsonism.