1 When there is a deficiency of vitamin B6 can cause excessive hair growth on the face. 2  The supplement rich in vitamin B6 in the diet, frequently stop facial hair growth in women naturally. 3  Wheat bran, breakfast cereals, hazelnut, potatoes, chicken, fish, peanuts, liver, etc 4  .... Bananas are a rich source of vitamin B6. When there is a deficiency of vitamin B6 can cause excessive hair growth on the face. 2  The supplement rich in vitamin B6 in the diet, frequently stop facial hair growth in women naturally. 3  Wheat bran, breakfast cereals, hazelnut, potatoes, chicken, fish, peanuts, liver, etc 4  .... Bananas are a rich source of vitamin B6.