Sodium:iodide symporter that mediates the transport of iodide into the thyroid gland (PubMed:12488351, PubMed:18372236, PubMed:18708479, PubMed:20797386, PubMed:31310151, PubMed:32084174, PubMed:8806637, PubMed:9329364). Can also mediate the transport of chlorate, thiocynate, nitrate and selenocynate (PubMed:12488351). {ECO:0000269|PubMed:12488351, ECO:0000269|PubMed:18372236, ECO:0000269|PubMed:18708479, ECO:0000269|PubMed:20797386, ECO:0000269|PubMed:31310151, ECO:0000269|PubMed:32084174, ECO:0000269|PubMed:8806637, ECO:0000269|PubMed:9329364}. This is the function of Ensembl gene identifier ENSG00000105641 (SLC5A5, solute carrier family 5 member 5).