Kobylecki et al. used one SNP, rs33972313, in the SLC23A1 gene region, which encodes sodium-dependent vitamin C transporter 1, as the genetic instrument for serum vitamin C, and reported that vitamin C was not associated with incident CHD nor all-cause mortality in a cohort of 100,000 Danish participants [51]. This evidence concerns the gene SLC23A1 and coronary artery disorder.