DHA transport gene SNPs in SLC2A1 (rs1105297 and rs3754223) were not associated with plasma ascorbic acid concentration (p = 0.32 and p = 0.76) or the risk of islet autoimmunity, type 1 diabetes, IAA first or GADA first, either alone or in conjunction with the plasma ascorbate status. Here, SLC2A1 is linked to type 1 diabetes mellitus.