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What is the best way to grow hair long and fast?

Well I have been trying to grow my hair out for about 3 years now, and it has only grown approx. 4 inches..and yeah, I am female so expect me to make a fuss out of it,haha. But I have been taking extra vitamins for it, tried a salon brand shampoo/conditioner. Not seeing fantastic results. I have that L'OREAL Lash Serum and eyelashes are hair so I am tempted to try it, haha. But before I go crazy I must ask Yahoo people! So is there a for sure thing product, or natural remedy or anything that is THE best?
Please, no smartass comments like "get extensions" And If you are going to comment, please be serious and give me your best answer.
Thanks~