There is no such thing as a good feed through joint supplement.
The molecules involved are too large to be absorbed by the horses digestive system. They are herbivores. They do not absorb animal products like glucosamine the same way as humans. As well much "food quality" glucosamine is produced from shark fins :(
MSM has been shown to work to strengthen surrounding structures. The only other thing I would feed through is a good anti inflammatory (only on a non competing horse and do not mix buckets with any competing horses!). There are natural ones like devils claw, and then traditional NSAIDs like Aspirin. Did your vet really suggest a feed through glucosamine supplement? Vets know they don't work (at least mine does) :(
Adequan is your best bet. There is another PSGAG on the market for much less that Adequan, called Icon. Pentosan is NOT like Adequan. There is no glucosamine in the molecule. I would try Icon before Pentosan. I have not used Icon, but I know folks that do.
As well, initially, get a shot of IV Legend to get the juices flowing and to get a handle on the inflammation right away. You may never need to do another one.
As well, DO THE PSGAG SHOTS IN SERIES. Adequan, and Icon, are NOT effective when given monthly. They must be administered in a series. Go with the manufacturer recommendation. For Adequan it is 7 shots, one every 4 days. Then the horse will be good for a while! Then repeat when needed (the whole series). Monthly shots are a waste of product and your money.
JMO, even a phone call with another vet to see if your program is "standard" for your area can be a good idea. Joint care is a very developed field, although a little taboo to talk about, and science is waaaay past archaic glucosamine feed through sups which don't even work and animal cruelty is used to make the product.
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