An at-home test is a convenient way to monitor your vitamin D levels and can be an important first step in learning to manage this common deficiency.

If the vitamin D blood test was 30 ng/ml (75 nmol/L) and a 40 ng/ml (100 nmol/L) level was desired, 1,000 IU (25 mcg) of vitamin D per day over several months should be taken to achieve a normal ...

OU Health's Dr. Catherine Mims explains why vitamin D is critical for bone, brain, and immune health, and how to safely maintain healthy levels year-round.

The guidelines also recommended vitamin D blood tests for people who may be deficient. The lead author of the statement, Dr. Bess Dawson-Hughes of Tufts University, noted that many people ...