What's the best joint supplement?
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Adequan (injectable, cheaper than Legend)
First of all, Adequan and Legend have two entirely different purposes and both used in conjunction are much better than either one used alone. If you are looking for a cost cut then get a vet who will inject the generics (I find it's about 50% of the brand name cost).
Adequan helps the cartilage regenerate and resist damage and Legend increases the amount of joint fluid in the joints, cushioning it better and overall preventing damage.
Legend actually reduces joint inflammation and provides relief for arthritic horses, Adequan will not provide as much relief to arthritic horses as soon as Legend does. After a loading period, the Adequan will start to regenerate cartilege and in order to see extreme result must be used long term. If you are going to do the full loading I think it's 1 injection every 4 days for 6 injections, which is a lot more expensive than one shot of Legend.
MN if it were me I would inject generic Legend and Adequan once every 4-6 weeks (depending on how affordable you need it to be - 4 weeks is better but 6 will do). If you need to cut something, I would cut the Adequan and just do Legend, and depending on how bad the arthritis is you can also wait until she is stiffening up again and get a shot of Legend into her just whenever she needs it. If you decide to do Adequan, you're basically stuck on a schedule of one shot a month or a little more.