Hair loss is caused by several factors such as hormonal and genetic issues, chemotherapy, medication, auto-immune disorders, nutritional deficiency, stress, depression, and thyroid problems. If the hair loss is caused by vitamin deficiency, hair growth supplements may help. Eating a balanced diet can help you maintain your overall health and improve hair growth. However, if hair loss is not a result of poor diet or nutritional deficiency, there’s no evidence in support of taking extra supplements to promote hair growth.