What senior horse joint supplement do you recommend

I have been looking in to buying and using some joint supplements for my 2 senior horses in their 20s. In the SmartPackEquine magazine, they have SeniorFlex especiall for senior horses, but I am not sure if it is the right thing. I feed my horses Nutrena Senior feed, Lifestyles brand not the John Lyons brand. I heard that if there are certain minerals or vitamins in their feed, you shouldn't get a supplement that has one or all of those same vitamins as it can overload their system, is this true? Lately I have been hearing little cracks when the walk and they don't want to lift up their feet anymore because I think it is painful or something, but sometimes they do. Could someone tell me what I should do or use?

I strongly recommend Adequan IM - they've got arthritis, no doubt about that. X-rays would prove it.

As of right now, there is NO SCIENTIFICALLY PROVEN feed-through supplement that combats arthritis. When you buy joint supplements, you are buying on unquantified, EMPTY CLAIMS. I hate spending my money on a hope and a prayer.

Adequan IM, however, contains both hyaluronic acid (joint fluid) and an anti-inflammatory to help stop the immune reaction which exacerbates arthritis. It's also less invasive than direct joint injection (Legend), leaves no scar tissue in the joints, and does not expose the joints to infection the way Legend does.

Adequan IM costs about $45 per horse per month, if you give it monthly, and if you yourself can administer the shots. This may cost more than CortaFlex, Cosequin, so on - but it is PROVEN to work. I've known many horses that Adequan has kept rideable - one of my own, too.