Its a multi level marketing thing. A coworker has been pushing it, and a few of us have been guinea pigs. There's a long list of things its supposed to cure, but I for one can't get past the taste.
To answer your question: No I have not tried it, but I DO use Irwin Naturals 3-in-1 Joint Formula, Liquid Gel . Get it at amazon.com or drugstore.com. Its condroitin, glucosamine and MSM with a buch of other $hit to increase circulation (niacin, stinging nettle, etc), Its the cocktail that works. I wrote the review on drugstore.com Oct. 2005. Great for the joints/ knees.
It took away my neck pain, I used to twist around at waisttoturn my neck, now my neck feels great, no more leg cramps at night. I believe in monavie, also ithas other helpful ingredients.