I have been taking NOW Brand MSM powder pretty much daily since December 2010. I experienced decreased joint issues, fuller breasts and lighter, shorter periods. Dunno about increased growth though. The first week, I experienced the bowel issues and I only took about 1000 mg dosage. Once it died down at the end of the first week, I increased to 2000 mg and then to 3000 mg after another 1.5 weeks. I've been on 3000 mgs for the majority of the time I've been using it.
In August 2011 and September 2011, I stopped taking it. My back pain returned. The minute I started taking it again, my back pain went away. So I'm gonna keep taking it.
Since October 2011, I've only been taking 1000 mg/daily. I still experience the benefits mentioned. I switched from the powder to the powder capsules though for convenience. I used to pour a tsp (3000 mg) into a shot glass, fill it with water and take it that way. Some ladies pour it into juice. I can't do that b/c sometimes I don't finish my juice or my son may ask for some.
Lastly, there was a really good thread about the Benefits of MSM or something like that. You can see what the consensus was in that thread.
GL!