Registry of Toxic Effects of Chemical Substances (RTECS)

The Registry of Toxic Effects of Chemical Substances (RTECS) is a toxicology database of over 140,000 chemicals compiled, maintained, and updated by the U.S. National Institute of Occupational Safety and Health (NIOSH). Its goal is to include "all known toxic substances... and the concentrations at which... toxicity is known to occur".

Chemwatch
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