She's lying to you, or just don't know better.
It is absolutely NOT even close to "basically the same thing", and truly, I'd be tempted to report her for misleading you up front.
How is she even calling it "Adequan Compound"? There is Adequan, and there is not-Adequan which covers a wide range of things.
Adequan is polysulfated glucosaminoglycan. Not even remotely close to acetyl-d glucosamine.
Adequan is around $300 for 7 vials. How much that ends up being a month depends on whether you use it monthly, every other week, or just a loading dose 1-2 times a year.
Take this FWIW
Yes, the study was done by the owners of Adequan. I don't know the details of the study and how the effectiveness was determined. If it was purely based on the changes to the cartilage, that's pretty objective and not much open for interpretation. If it was done based on reduction of lameness issues, that can get fuzzy.Only one study has been done comparing Acetyl-D-Glucosamine to the FDA-approved PSGAG product, Adequan®. This study was funded by Luitpold, the manufacturer of Adequan and presented at the American Association of Equine Practioners (AAEP) conference in 2004. In this study, Acetyl-D-Glucosamine was found not to be as effective as Adequan at the conventional dose and treatment interval. The author of the study said that while products such as Acetyl-D- Glucosamine are "likely" to have a "positive effect on injured or diseased equine joints," the work has not been done to determine an appropriate dose or treatment regime.
Here's another study, apparently after the above, or the above author didn't know about it
which states that Adequan was significantly more effective than either acetyl-d glucosamine or chondroitin monosulfate.
Does that mean NO horse receives ANY benefit? Nope