You won't get any help for your knees with that crap.
https://nccih.nih.gov/research/results/gait/qa.htm
here is what works
http://sciencebasedmedicine.org/knee-osteoarthritis-thumbs-down-for-acupuncture-and-glucosamine/
TD;DR
exercise, weight loss and good ol' NSAIDs
NOOOOOO! But... what happens when the exercise that you do is what is destroying your knees? (i.e. BJJ) Don't crush my illusions, @kyriacos, maybe I am getting some placebo effect out of it ;-)
I usually read the analysis published in Examine.com (where they compare the attributed benefits of some supplements/foods to the actual scientific evidence sustaining such claims):
https://examine.com/supplements/glucosamine/
The evidence for glucosamine helping with pain and recovery is not super strong, but I decided to take the supplement regardless, as some sort of "insurance policy".