I have grand meadows HA synergy which I highly rate as a good joint supplement. Have been using it for over a year now on two horses, one just old and stiff and the other young but with bad arthritis. It helps them both to be a lot more supple so I am very pleased with it, the younger one was actually on and off lame until I put him onto this, he has been fine ever since. Also my old horse is a fussy eater and won't normally touch feed if it has any supplements in, but he loves the taste of this and licks his bowl clean to get every last bit
I've used the human supplements & Grand Flex on the advice of the company and unfortunately I haven't noticed any difference when using them. I have given my very arthritic dogs the human tablets as they did benefit from human cortaflex, but they did not improve at all when on the Grand Meadows tablets. Sorry! I've taken both horses & dogs off this brand as it didn't work for them but I did only have the horses on the maintenance supplement so maybe one of the stronger ones would have worked.