Have to add collagen type II to the list. A few human and numerous animal studies have shown that it significantly reduces joint pain. Combined with Glucosamine & Chondroitin seems to be superior to either alone.
It's something else that is not really heard about because there's no money in it to attract attention of big pharma or medical industry.
Could be worth a try for pain reduction. The following product sounds good, but i can't speak from experience.
ImmuCell Kolla2 Collagen Type ll 600mg 120 Capsules by Neocell Laboratories - $24.99