ingestion. The concept of tolerable daily intake is often used for unwanted contaminants or other chemicals. The ADI concept can be understood as a measure to indicate the toxicity from long-term exposure to repeated ingestion of chemical compounds in foods (present and/or added), as opposed to acute toxicity. The threshold limit value (TLV) of a chemical substance is a level to which it is believed a worker can be exposed day after day for a working lifetime without adverse effects. See also Acceptability Dietary Reference Intake Reference dose Food labeling regulations International Programme on Chemical Safety Notes External links Questions and Answers about Acceptable Daily Intake, International Food Information Council. Concentration indicators Nutrition Toxicology