Abbreviation for "acceptable daily intake" (acceptable daily intake = ETD permitted daily dose). This refers to the tolerable amount of a substance that a person can take in daily over their entire lifetime without any negative or adverse health effects. As a rule, the quantities are determined in animal experiments, whereby the relevant substances (harmful substances) are ingested daily via the diet over a longer period of time. The information is then given in mg/kg body weight.
An amount of a substance that has not caused any changes in animal experiments is called a no-effect level (NEL, internationally also NOEL = No Observed Effect Level). To calculate the maximum tolerable amount in humans, this value is divided by a safety factor (usually 100).
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