When it comes to vitamins and minerals, the phrase Recommended Daily Allowance or RDA comes up quite often. What does this mean? The RDA is the amount needed to meet the requirements of 97.5% of healthy individuals. Basically enough to prevent deficiencies in almost all of the population. For optimal health, quantities higher than the RDA but lower than the tolerable upper limit may be needed.
Food and Nutrition Board, Institute of Medicine, National Academies, 2004, retrieved 2009-06-09
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