NIH - National Institutes of Health

TOXNET - This database gives access to toxicology, hazardous chemicals, environmental health, and toxic releases for chemicals, including household products.

PubChem - This open chemistry database provides the Laboragtory Chemical Safety Summary (LCSS), which has easily accessible, helpful information for directors and instructors of research and teaching laboratories to assist in the development and implementation of safe laboratory practices.  NCBI Minute: PubChem, a Source of Laboratory Chemical Safety Information is a webinar presented on June 7, 2017 that gives information on how to access the LCSS to find the most relevant chemical safety information including flammability, toxicity, exposure limits, exposure symptoms, first aid, handling, and clean up.