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Adequate intake (AI) is the recommended average daily intake of a nutrient, based on observation, testing or approximate estimates of the nutritional intake of one or more groups of apparently healthy people who appear to maintain an adequate level of nutrition.

Tolerable upper intake level (UL) represents the highest continuous daily intake of a nutrient that does not appear to carry risks of adverse health effects in most members of a given group, defined by stage of life and sex.  The risk of adverse effects increases as intake exceeds the UL.

These reference values were established by Canadian and American scientists, and are part of a comprehensive set of nutrient reference values.3


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