Vitamin D3

If your system doesn’t have enough vitamin D, new hair growth can be stunted. Vitamin D deficiency has been associated with alopecia, an autoimmune condition that causes bald patches on the scalp and other parts of the body. Vitamin D is generated by your body when it comes into direct contact with the sun’s rays. Fatty fish, cod liver oil, certain mushrooms, and fortified foods are all good sources of vitamin D.