The Urine Metabolome database is a freely available electronic database containing detailed information about ~3100 small molecule metabolites found in human urine along with ~3900 concentration values. Each metabolite entry contains more than 110 data fields and many of them are hyperlinked to other databases (KEGG, PubChem, ChEBI, Chemspider, DrugBank, PDB and Uniprot). The information includes literature and experimentally derived chemical data, clinical data and molecular/biochemistry data.