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Registry of Toxic Effects of Chemical Substances (RTECS) from NIOSH provides toxicological information with citations on over 130,000 chemical substances.  These detailed profiles include toxicological data and reviews; international workplace exposure limits; references to US standards and regulations; analytical methods; and exposure and hazard survey data.  The data is compiled into substance records for ease-of-use, and updated data is fully integrated.  Original coded NIOSH data is replaced by full text descriptions.

• 367,000 chemical names and synonyms, and 109,000 unique CAS numbers
• specific toxicity data such as LD₅₀, LC₅₀, tumorigenic and reproductive effects
• carcinogenicity status by OSHA, IARC, NTP, ACGIH, EPA Genetox Program

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