Drink a lot of water. It is good for everything.
Once or twice a week, massage your scalp and hair with virgin coconut oil and let it on for at least one hour, better all night long.
Let your hair dry naturally in the fresh air and don´t use hair blowers.
If you use shampoo, try to find the most natural one. Dilute it with water and only shampoo once, don´t repeat.
It wouldn´t hurt to take a natural vitamin supplement.