As a rule, younger people need less vitamin D than older people, regardless of sex. This article explains average vitamin D ...

Low vitamin D levels aren't always detectable, but symptoms can occur if you have a deficiency. Here are the signs and how to ...

before recommending the 25-OH vitamin D test. Health care professionals need to keep in mind that in general, 100 IU (2.5 mcg) of vitamin D per day can raise the vitamin D blood test only 1 ng/ml ...

Data on serum 25(OH)D3 concentrations were available for the subcohort only, which prevented the investigation of whether vitamin D–deficient participants would have benefited from supplementation.

In the liver, vitamin D3 is hydroxylated to form 25-hydroxyvitamin D3 (25(OH)D3), the main circulating form of vitamin D3. This compound is then further hydroxylated in the kidneys to form 1,25 ...