I use NAF 5*superflex. My boy was quite stiff coming out of his stable when i got him.He is only 11 so i thought something might help. He is never stiff now and i certainly think its made a difference
I use NAF superflex too. My horse has ringbone, and the vet advised i used synequin, however at 100 quid a tub and the insurance refusing to pay out it wasnt an option, although he was on it for a while and it seemed to help.
He seems just as good on superflex now! He certainly jumps better when hes on it!