Vitamin D is an essential nutrient that plays a role in many of the body’s functions. A vitamin D deficiency may cause numerous problems, including hair loss.
Does vitamin D deficiency cause hair loss?
There is some evidence that having a vitamin D deficiency does cause hair loss and other hair problems. Vitamin D stimulates hair follicles to grow, and so when the body does not have enough, the hair may be affected.
A vitamin D deficiency may also be linked to alopecia areata, an autoimmune condition that causes patchy hair loss.
Research shows that people with alopecia areata have much lower levels of vitamin D than people who do not have alopecia.
Vitamin D deficiency can also play a role in hair loss in people without alopecia. Other researchTrusted Source shows that women who have other forms of hair loss also had lower levels of vitamin D.
How does vitamin D affect hair?
Vitamin D affects the health of many parts of the body, including the skin and hair.
Vitamin D plays a role in the creation of new hair follicles. Hair follicles are the tiny pores from which new hairs grow. New follicles may help hair maintain thickness and prevent existing hair from falling out prematurely.
Because of this link, getting adequate amounts of vitamin D can support hair growth and regrowth.