Dont use shampoo everyday. I know this sounds crazy but shampoos are chemicals. I use shampoo and conditioner every other day and a bath everyday. My hair has been healthier and growing a little faster.
First you need to warm up some olive oil and spread it on your hair roots leave it for 5 minutes then rinse. Repeat daily. To grow even faster take folic acid pills or eat alot of food that contains it.