you cant really speed hair growth, though you can do stuff that does help with healthy growth. check your diet, lots of water and healthy vegies, protiens is a must. I used to take biotian, its great it helps, will start it again, msn is good as well, helps with hair growth and stregth.
ive got a scalp stimulater hair growth oil mixture, wich is great i love it, it really works.
how ever, nothing works over night, hair grows in stages, with the diet, biotian and msn, you should give 6 weeks to work. though with the oil mixture, you can notice it sooner

my hair: 3b, high porosity, high density and coarse hair (i think i finally figured that all out)
my hair loves conditioner only styling!
Oils and my own procuts are my hairs best friend
my hair goal length is bra strap length when curly.