Is it ok to take prenatal vitamins for hair growth?

I'm 16, and I got a terrible hair cut...lets just say my hair was to my waist and now it's to my collarbone...and it's naturally curly. Is it healthy for me to take prenatal vitamins to make my hair grow?Will they even make my hair grow, or is that a myth? I'm already taking biotin and some other hair/skin/nail vitamins from GNC. I just want my long, curly, beautiful, blonde hair back so I can stop crying!!!