Use coconut oil! You can get it at any beauty/ cosmetics store.
All you need to do is massage the warmed oil into your scalp about 2 times a week and leave it in overnight. Make sure to wash it out with shampoo so that the oil doesn’t build up and clog the follicles.
Not only does coconut oil accelerate hair growth, it also repairs it! Here are all the benefits of using oils, especially coconut, for your hair. http://www.buzzle.com/articles/coconut-oil-for-hair-growth.html