The function of ENSG00000144908 (ALDH1L1, aldehyde dehydrogenase 1 family member L1) is as follows. Cytosolic 10-formyltetrahydrofolate dehydrogenase that catalyzes the NADP(+)-dependent conversion of 10-formyltetrahydrofolate to tetrahydrofolate and carbon dioxide (PubMed:19933275, PubMed:21238436). May also have an NADP(+)-dependent aldehyde dehydrogenase activity towards formaldehyde, acetaldehyde, propionaldehyde, and benzaldehyde (By similarity). {ECO:0000250|UniProtKB:P28037, ECO:0000269|PubMed:19933275, ECO:0000269|PubMed:21238436}.