The function of SLC25A40 (solute carrier family 25 member 40, Ensembl gene identifier ENSG00000075303) is as follows. Probable mitochondrial transporter required for glutathione import into mitochondria (PubMed:34707288). Glutathione, which plays key roles in oxidative metabolism, is produced exclusively in the cytosol and is imported in many organelles (PubMed:34707288). Mitochondrial glutathione is required for the activity and stability of proteins containing iron-sulfur clusters, as well as erythropoiesis (By similarity). {ECO:0000250|UniProtKB:Q8BGP6, ECO:0000269|PubMed:34707288}.