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 are linked to many health benefits, including decreasing the chance of heart disease, supporting immune function, and aiding weight loss. New research suggests that calcium and ...

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 ...