no observed adverse effect level

https://doi.org/10.1351/goldbook.NT06911
Greatest concentration or amount found by experiment or observation, which causes no detectable adverse alteration of @MT07285@, functional capacity, growth, development, or life span of the target organism under defined conditions.
Sources:
PAC, 1993, 65, 2003. (Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)) on page 2076 [Terms] [Paper]
PAC, 2001, 73, 993. (Risk assessment for occupational exposure to chemicals. A review of current methodology (IUPAC Technical Report)) on page 1023 [Terms] [Paper]
This definition replaces an earlier definition of no-observed-adverse-effect-level (NOAEL).