Deficiency in B vitamins, vitamins C and D, and minerals like iron and zinc have been linked to hair loss. Excessive intake might also lead to hair loss. Vitamin deficiencies like D, B12, and iron can cause hair loss. Addressing them with diet or expert care from Dr. Jae Pak can restore healthy hair. Consuming adequate vitamins and minerals is important to preventing and managing hair loss. Most people can cover all their nutritional needs through a healthy, balanced diet. However, if blood tests show that you have certain vitamin or mineral deficiencies, your doctor may recommend supplements. For example: Certain vitamin deficiencies are linked to hair loss. Too little iron, vitamin D, zinc, or other nutrients may cause changes in your body that lead to alopecia.