of vitamin D per day can raise the vitamin D blood test only 1 ng/ml or just 2.5 nmol/L after 2 to 3 months. How much vitamin D is needed per day to obtain a normal vitamin D blood level?

For adults, a level of vitamin D in the blood of 20 nanograms per milliliter (ng/mL) or above is generally considered adequate. Levels below 20 ng/mL are generally too low for adequate bone health ...

A 42-year-old woman with treatment-resistant insomnia discovered her vitamin D level measured just 18 ng/mL despite living in a sunny climate. After three months of supplementation bringing her ...

Other organizations define a vitamin D insufficiency as 12 to 19 ng/mL (30 to 47.4 nmol/L ... 1 to 13 years 15 mcg or 600 IU 14 to 18 years 15 mcg or 600 IU 19 to 50 years 15 mcg or 600 IU ...

While low levels of vitamin D are linked with increased risk of CRC, there are no definitive answers. Here’s what we know—and ...

(Garland et al., 2009) used epidemiologic data to argue for increasing the average serum levels of vitamin D to 40-60 ng/ml (100-150 nM), a level that they suggest could be achieved by an intake ...

A level less than 12 ng/mL indicates vitamin D deficiency and could be a sign of absorption issues, according to the National Institutes of Health. If you are concerned about your vitamin D levels ...