I've used MagnaGard supplement for a couple yrs on my mare. I'd stopped for a while when I'd been using 2 other supplements for arthritis and joint issues. She had gotten stiffer so one day I gave her one of the tubes. I was surprised that she suddenly moved a little more freely so I began using the product daily again, along with other supplements. They can't tell u if it's helping but I'm continuing it to see what happens.