I was on MSN 1,000mg for a couple of months and all it did was make my skin break-out. Other than that, I haven't really noticed any differences to my hair. On the container it says "Effective Joint Pain, Osteoarthritis Relief." Not sure why so many people on this forum take it. It would be interesting to hear of somebody who's had a positive experience with it!
I have never taken any proven treatments but, I think MrJobi is right. Supplements like Saw Palmetto, MSN, etc. won't do much for your hair...