The function of Ensembl gene identifier ENSG00000135917 (SLC19A3, solute carrier family 19 member 3) is as follows. Mediates high affinity thiamine uptake, probably via a proton anti-port mechanism (PubMed:11731220, PubMed:33008889, PubMed:35512554, PubMed:35724964). Has no folate transport activity (PubMed:11731220). Mediates H(+)-dependent pyridoxine transport (PubMed:33008889, PubMed:35512554, PubMed:35724964, PubMed:36456177). {ECO:0000269|PubMed:11731220, ECO:0000269|PubMed:33008889, ECO:0000269|PubMed:35512554, ECO:0000269|PubMed:35724964, ECO:0000269|PubMed:36456177}.