DV vs RDA
When viewing a product label on any food, one would logically expect that when a product label says 25% of the Daily Value (DV) of a vitamin or mineral, it also means, that it supplies 25% of the daily amount that is recommended you consume. But it does not; DV and the RDA recommended by the Institute of Medicine are not interchangeable terms or concepts and must not be confused with each other.
The foundational basis for Daily Values is dependent on averages of populations that did not take into account the different nutritional needs for males, females, infants, children, adults, and the elderly. Daily values can meet the needs of only 50% of the population with some below the RDA and others above.
As an illustration, the product label on a box of the ready-to-eat cereal, Go Lean Crunch, shows a potassium intake of 330 mg per serving and lists this at 9% of the Daily Value (DV). The RDA for potassium intake is 3000 mg for 1-3 year old children and 4700 mg for adults, and 9% of these two numbers are 270 and 423, and not 330. Nine percent of the DV is not equal to 9% of the RDA.