Firstly, see your doctor.  He must examine you and run certain tests to ensure all else is fine, medically speaking.  At the same time, you can work on improving on your diet, including adding vitamins to ensure you are getting all the nutrients that are essential for healthy living and healthy hair.

Start by eating more fruits and vegetables.  Reduce your intake of animal proteins. Then, supplements.  Biotin (vitamin B7) and vitamin B5 are great in maintaining healthy hair and helps follicles to regrow new hair.   Vitamin B12 is also helpful as it helps produce red cells. Vitamin B12 deficiency can cause problems for years.

Vitamin C helps to maintain proper circulation, which is the essential for follicles.  If you are a smoker, you should increase the amount of vitamin C you intake as smoking depletes this vitamin.

Vitamin A deficiency leads to weak, dry and brittle hair.  This can lead to problems of hair breaking off.

With that said, it is important to ensure that you are getting the right amount of these vitamins in order to avoid any type of vitamin overdose.  Certain vitamins are stored in the liver and can cause problems you intake too much. Therefore, in order to avoid such problems, it may be better for you to take specialized formulated vitamins to counteract this problem and help with your hair loss.

A diet lacking in this vitamin can result in premature aging, colitis, increased amounts of bile salt build-up in the intestines and reduced energy.

Foods that contain Vitamin K include:  egg yolk, milk, yogurt, alfalfa, spinach, cabbage, cauliflower, tomato, and green leafy veggies.

A diet deficient in vitamin E in men can result in sterility; in women it can lead to repeated miscarriages; in both men and women, it can result in stroke, heart disease.

Foods that contain Vitamin E include: nuts, wheat, wheat germ, whole grain foods, cereals, green leafy veggies, milk and eggs.

The recommended daily requirement of Vitamin E is 15 IU.

It is beneficial in treating nervousness, constipation and muscular fatigue.

A diet lacking in Vitamin D can result in the deformation of bones and tooth decay.

Toxicity can occur if exceeding dosage.  The body cannot excrete this vitamin naturally. The signs associated with toxicity are thirst, itchy skin, vomiting, diarrhea, soreness in the eyes, frequent urination and others.

The recommended daily allowance of Vitamin D for adults is 400 to 500 IU.
The recommended daily allowance of Vitamin D for children is 400 to 500 IU.

Smokers should also increase their dosage of vitamin C, as smoking depletes its effects.  Also, seniors require a greater need for this vitamin.  Fortunately vitamin C is the type of vitamin that is actually quite safe to use.  Even in high doses, the body will use exactly what is needed and excrete the excess.

It diet lacking in vitamin C can result in anemia, a fatigue, premature aging, decreased resistance to infection, bleeding gums, swollen and painful joints, and a sluggish healing of wounds.

Foods that contain vitamin C include: oranges and other citrus fruits, green leafy vegetables, tomatoes, berries, and potatoes.

The recommended daily allowance of vitamin C for adults is 50 to 75 mg.
The recommended daily allowance of vitamin C for children is 30 to 50 mg

A diet lacking in cobalamin can result in an anemia, lethargy, a decrease in appetite, and some mental disorders. Therapeutically, it has been used to treat fatigue, insomnia, depression, and poor memory.

Foods that contain vitamin B12 include: liver, meat, kidneys, milk, eggs, bananas, and peanuts.

The recommended daily allowance of vitamin B12 for adults is 3mcg.

A diet lacking in folic acid can lead to anemia, and hair loss, fatigue, poor circulation, depression and serious skin disorders.

Foods that contain phenolic acid include green leafy vegetables like spinach and lettuce, yeast, mushrooms, liver, peanuts and other nuts.

The minimum daily requirement of folic acid is 0.4 mg.

Vitamin A, in its acidic form, 13-cis retinoic acid (isotretinoin), is the most effective drug for acne treatment. It reduces bacteria in the ducts and skin, and reduces inflammation. Tretinion, a topical cream has been shown to reduce fine lines and wrinkles. Both of these products require a doctor’s prescription. Retinova is a prescription cream that had very positive results and therefore, retinol was created, a less intense version of it and obviously its results are not as effective, however it has proved in studies to reduce wrinkles. One study showed moisturizers containing 0.4% of retinol greatly reduced fine wrinkles, but once stopped, the benefits cease as well.
In rare cases, vitamin A deficiency exists in the developed countries. It is a concern in underdeveloped countries, however. Vitamin A deficiency is due to an inadequate consumption of green and yellow veggies and fruit, and it affects vision among others. However, toxicity is possible with too much Vitamin A. Talk to your doctor before taking any new vitamins.
Foods that contain vitamin A are: carrots, broccoli (florets contain much less than leaves), sweet potatoes, kale, spinach, pumpkin, peas, winter squash, liver, beef, pork, melon, apricots, to name but a few. By adding these foods to your diet you will soon see a significant improvement to your skin and how to reduce wrinkles naturally.

Vitamins are divided into two main categories: fat-soluble and water-soluble.

Fat-soluble vitamins are stored in the body, more often than not, in the liver. They are not easily lost in most methods of preparation and are mesured in international units. The following are fat-soluble vitamins:

A
D
E
K

Water-soluble vitamins are lost in food preparation, therefore, it is advised to not overcook foods in order to avoid this loss. Within the body, these vitamins are not stored, hence, it is important to eat foods containing these vitamins daily and are measured in either milligrams or micrograms. The following are water-soluble vitamins:

B group or B complex
C

Antiaging vitamin therapy to prevent premature aging and remain youthful is possible but must be approached with caution AND only with your doctor’s consent. Too much of anything is bad for you, including vitamins.

A diet lacking in vitamin B6 can cause dermatitis, skin disorders, nervousness, insomnia, depression, migraines, conjunctivitis, anemia, and heart disease.  This vitamin is being studied rigorously, more than all other vitamins as researchers believe that there is much promise in treating various illnesses such as asthma, arthritis, kidney stones, blood clots, nervous disorders, and hyperactivity in children.

Foods that contain pyridoxine include: wheat, wheat germ, cereals, yeast, plan, soybeans, walnuts, liver, meat, vegetables, bananas, milk, and eggs.

The recommended daily allowance of pyridoxine for adults is 2 mg.
The recommended daily allowance of pyridoxine for children is 0.2 mg