I don't know if if really does anything to help with my joint problems, but I've been taking a glucosamine supplement for decades. It's supposed to help maintain, or help to rebuild or repair the cartilage in your joints. When I first started taking it more than 20 years ago, I was still working a very physical job, and it seemed to lessen some of the pain in my knees when they first started showing signs of osteoarthritis.
Right now I take so many supplements, along with a dozen prescription meds, that I don't know if I'd notice a difference in my pain level if I stopped taking it or not.
The only medication that helps with the arthritis pain is Alleve. Those other OTC pain meds don't do anything for me. Whenever I'm having a really bad evening, which is when it happens most of the time, I can take 2 Alleve, which my doctor says is prescription strength. It takes a while to kick in, but when it does, I definitely feel better.
Good luck, having one of these conditions is bad enough, having both of them really sucks.