I personally would check out joint supplements before going with an injection. I suspect my guy has a bit of arthritis as he used to be really stiff and crack all the time. I put him on smartflex sr, and I saw results within a few weeks. I’ve been tempted to try other supplements, brands, ingredients, etc, but I just can’t make myself do it because he’s happy with the smartflex. It will take a few weeks to a few months to see full results, and you may need to try a few different types to find one that works best for your horse. If the supplements aren’t working, then you may need to look at injections.