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Vitamin D RDA and UL

Vitamin D RDA (in IU) for different age ranges.
The Institute of Medicine (IOM) has set recommended daily allowances and tolerable upper intake levels for intake of vitamin D. These are referred to, respectively, as RDAs and ULs. Keep in mind when going through these that vitamin D received from more than a small amount of sunlight exposure is not considered. For some people this may be a significant amount.

RDA

A person's RDA varies based on his age. In these present recommendations, there is no difference between the figures for male or female. Pregnancy and breastfeeding also do not affect these suggestions.

For infants anywhere from newborn up to 12 months of age, the IOM's RDA is 400 IU. Once the child reaches one year of age, the recommended amount increases to 600 IU. It stays at that level for quite a while, until a person is 70 years old! Once passing that age, though, the RDA jumps up again, this time to 800 IU.

It is also possible to express these amounts in micrograms (mcg), rather than IU. In that case, the first group's number would be 10 mcg, while the second would be 15 mcg, and the third and final would end up at 20 mcg.

UL

It is improbable that excessive vitamin D would be obtained through eating fish. Being in the sun will also not lead to excessive levels due to various factors. However, taking large amounts of supplements can result in vitamin D toxicity. Even below that particularly high level, there are amounts beyond which it is thought that chronic intake may lead to adverse results for a person's health. These are the tolerable upper intake, or UL, figures.

These numbers, like those of for RDA, are not affected by gender, current pregnancy, or whether or not a mother is breastfeeding. Age, however, does impact this case as well. During the first six months after birth, 1000 IU is the UL. During the next six months (up to 1 year old), the figure increases to 1500 IU. For those aged 1 up to 3, it is 2500 IU. When children are between 4 and 8 years old, the figure is set to 3000 IU. For anyone who is 9 years or older, there is a static amount of 4000 IU. Again, these figures can be converted to mcg. Each 40 IU counts as 1 mcg.

Further information

You can find more information related to vitamin D deficiency symptoms, risk factors, diagnosis, and treatment. The home page can also be accessed for more details.

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