When my daughters and I used the entire line of Gueye products faithfully, we were getting about an inch a month. We couldn't believe how fast our hair was growing! We've since moved back to the Midwest & Gueye isn't sold in this region.
I plan to stock up on Gueye hair products when I go back to Las Vegas in the Fall. You should get good results taking Gueye hair vitamins.
Consistency is the key!
Good Luck!