The Human Metabolome Library (HML) is a chemical resource with the power to help confirm, validate or quantify suspected metabolites in tissues or biofluids. The Human Metabolome Library has been developed through the efforts of the Human Metabolome Project. Each of the HML's ~750 in-stock compounds were acquired through purchase, custom synthesis or purification. Researchers may obtain metabolites from the HML for basic research purposes by contacting The Metabolomics Innovation Centre. Available compounds are provided in amounts of ~10mg each on a cost recovery basis, with the Metabolomics Innovation Centre acknowledged in any resulting publications or presentations.