Abbreviation for "acceptable daily intake". This refers to the acceptable amount of a substance that a person can take in daily throughout his or her lifetime without negative or health-damaging consequences. As a rule, the quantities are determined in animal experiments, whereby the corresponding substances (pollutants) are ingested daily through the diet over a longer period of time.
The information is then given in mg/kg body weight. A substance quantity that has not caused any changes in animal experiments is called no-effect level (NEL). To calculate the maximum tolerable level in humans, this value is divided by 100. The "safety factor 100" is intended to take into account unknown risks, such as particularly sensitive persons, extreme deviations from average consumption and other unknown factors. Thus, if a dose of 100 mg/kg body weight/day is considered safe for the animal, the acceptable daily intake in humans would be only 1 mg/kg body weight/day. This is the ADI value. The definition "not specified" means that the tolerable dose could not be or has not yet been determined. This is because for many substances, even large quantities do not produce effects in animal experiments. The ADI values are published by the WHO (World Health Organization).