I think it works wonders!

Roxey was having problems with one of her back legs.
She was having a hard time getting up and limping quite a bit. She started taking it and within a few months she was getting up with no problem and no limping.

I definitely give it a thumbs up!

PS If you do decide to get it, don't get it from the vets because it costs twice as much I always order it from Amazon (much, much cheaper!)