I never thought about a vitamin D deficiency, but it makes a lot of sense.

Blood testing showed that half of them had a vitamin D deficiency.

One cause of vitamin D deficiency is limited exposure to sunlight.

However, much higher doses are often needed for the short-term treatment of vitamin D deficiency.

The combination of high blood pressure and vitamin D deficiency could be deadly.

Nevertheless, vitamin D deficiency is more common than you might expect.

A vitamin D deficiency is a known cause of rickets.

Older people are also at risk for vitamin D deficiency.

In recent years, many studies have linked vitamin D deficiency to a host of health problems, including cancer and heart disease.

The reasons for this are unclear, but may be related to vitamin D deficiency during the winter.