Keith Baar's videos on YT have helped me a lot; both for treating my knee pain and for increasing overall muscle strength. The videos tell you how to heal or strengthen your tendons, ligaments, and muscles.

I found that second link interesting although it raised the question of why gelatin versus amino acids in general.

However neither link seems to have anything to do with UC Davis or biochemical mechanisms related to collagen supplementation. I realize that it probably wasn't your intent but the mismatch leaves me feeling vaguely as though you tried to deceive me there.