Do glucosamine supplements help with joint pain?

Just curious as to what the source is for this Not taking a combination)?
I read this:
_“On the other hand, another 2018 analysis observed a significant improvement in pain scores when glucosamine and chondroitin were taken together, while no improvements were found when the supplements were taken separately (14Trusted Source).”

Link

Here is another interesting read on the subject:
Link:
Claim is that the glucosamine sulfate form is the best. I just noticed that the Kirkland brand is glucosamine hydrochloride.