Upper limit
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Ul. The largest daily intake of a nutrient considered safe for most people. Taking more than the ul is not recommended and may be harmful. The ul for each nutrient is set by the food and nutrition board at the national academies of sciences, engineering, and medicine. For example, the ul for vitamin a is 3,000 micrograms/day. Women who consume more than this amount every day shortly before or during pregnancy have an increased chance (risk) of having a baby with a birth defect. Also called the tolerable upper intake level.
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