A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in your blood. It can indicate whether the ...

New research finds that taking a daily vitamin D supplement may help lower blood pressure, especially for older adults with ...

Don’t let all those “ph-ph” words confuse you. Once your blood is collected ... Some medicines, vitamins, and supplements can impact your test results' precision. These can include diuretics ...

Almost all successful anti-fracture clinical trials have used vitamin D3 at a dosage of at least 800 IU/day (20 mcg per day). Ideally, the vitamin D blood test should be offered from the fall ...