Enables riboflavin transmembrane transporter activity. Involved in embryo development. Predicted to be located in plasma membrane. Human ortholog(s) of this gene implicated in several diseases, including Brown-Vialetto-Van Laere syndrome 1; Brown-Vialetto-Van Laere syndrome 2; and Fazio-Londe disease. Is an ortholog of human SLC52A2 (solute carrier family 52 member 2) and SLC52A3 (solute carrier family 52 member 3).