NOAEL (No Observed Adverse Effect Level)

NOAEL, or No Observed Adverse Effect Level, is the highest amount of a substance, such as a chemical or drug, that can be given to an organism without causing any harmful effects that are noticeable or measurable. It is determined through scientific studies and helps assess safety and risk. Essentially, it indicates a safe exposure level below which no negative health impacts are observed, guiding regulations and safe usage guidelines for humans and the environment.