How do I test my vitamin D level?

The best way to find out if you have a Vitamin D deficiency is to check your blood level of 25(OH) test vitamin D, which can be easily performed by any physician. The normal range is 32 to 100 nanograms per deciliter, but Ray & Terry recommend maintaining a level of at least 50 nanograms.

Although there is a risk for toxicity with excessive D intake, research indicates the current RDA and UL (official minimum and maximum intakes) are too low. Ray & Terry suggest 600-2,000 IUs of Vitamin D per day for almost everyone as part of their universal supplement recommendations. If your level is under 30, we suggest 5,000 IU per day until your level improves.