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The US RDA is a standard set forth by Food and Nutrition Board of National Academy of Sciences National Research Council to help Americans determine a proper level of daily vitamin intake. It is important to note, however, that these levels are sometimes quite modest— intended to meet nutrient needs of already healthy individuals. For some, these amounts may be lower than optimal. For example additional amounts of vitamins may be needed during illness. Consequently, Board has also set two other values: tolerable upper intake levels (UL) and adequate intakes (AI). The UL values are designed to help people avoid over consumption. AL values are established when there is not enough scientific evidence to set an RDA.
It is important to note that different developmental stages and physiologies may require varying vitamin intakes. Children, adolescents, women, and men all have differing needs. Consulting a specialist is best way to determine personal vitamin needs. Moreover, some supplements may negatively interact with prescription drugs. Therefore, all supplemental intakes should be discussed with a physician.
A proper balance of vitamin intake can enhance personal health and increase energy levels. These essential nutrients aid in regulation of many bodily functions and can prevent illnesses. Their value must not be underestimated.
Ruth Stattmiller enjoys writing about the benefits of vitamins.