Vitamin D tests involve taking a blood sample to measure the vitamin D levels in your bloodstream. There are two forms of vitamin D in the blood: 25-hydroxy vitamin D, or calcidiol, and 1,25-dihydroxy ...

Vitamin D deficiency impacts more than 1 billion people worldwide. Vitamin D deficiency can negatively affect a child’s growth, immune response, mental health, and more, which is why proper treatment ...

Vitamin D supplements might slow cellular aging by preventing the loss of telomeres, DNA sequences at the ends of chromosomes that shorten in old age, a new study suggests. The health effects of these ...

There may be an association between vitamin D deficiency and a higher body weight. However, it’s not clear whether vitamin D supplementation may help prevent or reduce weight gain. Vitamin D is ...

For a while vitamin D was looking like a bona fide health elixir. It was recognized a century ago as the cure for rickets, a childhood disease that causes weak and deformed bones. Then, in the early ...