I've never used products to make my hair grow faster myself, but I know some people who do use Tea Tree Oil shampoos and it does slowly increase hair growth. Doing deep conditioning treatments work too. You can also use Garnier Fructis Long and Strong shampoo and conditioner, which has vitamins B6 and Zinc which can help your hair growth.
I also know when you wash your hair, if you massage your scalp for a minute, espically around your hairline, it makes your hair grow faster. By massaging your head, it stimulates blood flow in your head, making your hair grow faster!
For vitamins: Vitamins B, C, F, Zinc, Iron, Copper and Protein are essential for hair growth. Drinking plenty of water and eating plenty of raw fruits and vegetables is probably the best way to achieving healthy, longer hair.
