I don't know what my rate is because I just started measuring my hair a month ago. I do know that this spring, my hair was about the same length as Ludacris' hair is in Sweetpea's signature. I flat-ironed it this weekend and surprised myself. I couldn't get it bone-straight, but when I kept my head straight and pulled the back of my hair down to it's full length, it was about an inch (or so) above my bra-strap. When i measured some strands from the root to the tip, I noticed that some are now 12" long. I've been taking MSM, Biotin, fish oil, and a multivitamin for the past month (along with lots of water).
I cut all of my hair off four years ago (down to about 1/2 an inch), but I was extremely stressed and didn't take good care of myself during most of that time. I'm sure that might have had some affect on my hair growth. Since this Spring, I've been virtually stress-free and now I'm taking better care of myself and added vitamins (since coming to this board) so it's all good from here on out! I'm expecting my hair to grow by leaps and bounds!!