Dear Frank," MSM (methyl-sufonyl-methane) is a special biological sulfur found 
in all plants, soils, fruits, vegetables, fish, poultry, eggs, meats and milk. 
It is organic sulfur, a naturally occurring compound in the human body. In the 
purified form, it is an odorless white crystal with a slightly bitter taste. "  
For more information see research on the website www.puresmsm.com/details.htm.  
There are lots of other sites, e.g. www.health-n-energy.com/msmprod.htm  and on 
the excellent site Liz just recommended ( in the articles):
www.familyhealthnews.com/   That should give you some to start with. Sincerely, 
Cora