Vitamin A has a big part in producing sebum. Without it you'll have dry hair, dandruff and a thick scalp. All of those symptoms could potentially cause you hair loss. First and second hand smoke along with aspirin and some prescription drugs could prevent Vitamin A absorption.
On the other end of the spectrum having too much sebum blocks hair follicles. So overdosing on Vitamin A could actually cause you even more hair loss.
Fortunately it's impossible to over dose on Vitamin A when you get it from food sources. Mango, Oranges, Carrots, Sweet potato and Squash are all good sources of Vitamin A.
2. Vitamin B
The B Vitamins are also a very important part of having healthy hair. All of the B Vitamins help with with hemoglobin which helps the scalp get the oxygen it needs for healthy hair growth. The main B vitamins that you need to focus on for hair growth are Vitamin B-6 and Folic Acid.
Vitamin B-6 is often found in protein rich foods. This kills 2 birds with one stone because both Vitamin B-6 and protein is needed to prevent hair loss. Potatoes, ready to eat cereals, Bananas, Garbanzo beans, Chicken breast, Oatmeal, Pork Loin, and roast beef contain Vitamin B-6.
Folic Acid is found in cooked lentils, collard greens, chickpeas, medium papaya, frozen peas, and boiled asparagus.
3. Vitamin E
Vitamin E helps provide good blood circulation to the scalp by increasing the absorption of oxygen. Ready made cereals, Almonds, Safflower Oil, Corn Oil, Soybean Oil, Turnip greens.
You probably don't have a Vitamin E deficiency but if you do it's most likely caused by an inability to absorb oils and fats. In this case taking a Vitamin E supplement is recommended.
4. Vitamin C
Vitamin C is responsible for the healthy development of collagen which is necessary for strong hair. Vitamin C can be found in Kiwi fruit, Guava, Red sweet peppers and Oranges.