Has anyone tried this? 

Yes, I used it on 1 horse as a last ditch effort.  I had tried other products, injections, therapies, etc. but he was still in the retired pen. After starting Eki gold, I saw pretty amazing results after about 3-4 weeks and even better results at 3 mos.  He is now back to work, thankfully, because he is the type that wants to work, begs to go with, and doesn't sit well.

This particular horse is 18 yrs, has an arthritic knee and arthritic hocks, and hock injections do nothing for him.  He won't ever run competitively again, but at least he is moving sound and back to work (walk, trot, canter and trails).

Downside, it's EXPENSIVE!  We are actually experimenting with another, affordable product now to see if we can keep him sound without breaking the bank.