My dog is going to be 14 years old this November.
I have been giving him Lipospheric Vitamin C with his food for some time because his eyes get a calcified look and he has arthritis in his hip.
I chose to try this product because he was experiencing quite a bit of knuckling on walks, he was having trouble making stairs, etc. I started him on this product right away when receiving it and discontinued the Vitamin C for a while so that I could see the effects of only this product. What I have noticed is that he has had more energy, he likes it ok to eat on his food, and his knuckling has definitely improved. I did feel the need after a while though to start giving him the lipo C with it due to the pain from arthritis and also the calcified eyes. I would rate this product good.
Bottom Line: No, I would not recommend this to a friend