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 research shows that women who have ……………