The function of NDUFA8 (NADH:ubiquinone oxidoreductase subunit A8, Ensembl gene identifier ENSG00000119421) is as follows. Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis (PubMed:27626371, PubMed:32385911, PubMed:33153867). Complex I functions in the transfer of electrons from NADH to the respiratory chain (PubMed:27626371). The immediate electron acceptor for the enzyme is believed to be ubiquinone (PubMed:27626371). {ECO:0000269|PubMed:27626371, ECO:0000269|PubMed:32385911, ECO:0000269|PubMed:33153867}.