Sally Beauty has this great bioterra shampoo/conditioner called long and strong that works great to protect the length you have. Also to grow it faster get their overnight deep conditioner treatment and comb it into your hair with a harder bristled brush to stimulate your scalp to promote growth. I have seriously grown my hair an inch and a half almost two inches a month!
Nothing is going to make your hair grow faster but if you condition it and keep the split ends trimmed it will look like it is growing faster. If your hair is in bad condition it can actually break off faster than it grows.