I have some experience feeding this product.
Concerning the mare that comes to mind first...
She was an 11 year old TB mare. She raced as a youngster, had a foal or two, was trained for western pleasure, and then jumping.
She was a victim(IMHO) of pinfiring, and had horrible contracted front tendons.
She was(is) stalled 20 hours a day, and worked a few times a week. At one point they had her in "training" in the Pessoa Lunging System to stretch her out. It did help, but was painful to watch the process. They also had her on Recovery EQ +HA. Personally I dont think it did much good, but at that point she was so far gone...
Another gelding I fed it too was a GP dressage horse. He also didnt seem to be affected by it much. He is now in a very extreme "Hoof Rehab" center. Again, take that for all its worth.
Good luck with your horse!