I'm a believer, too, Werebear. In Sept 2018, I managed to mysteriously acquire biceps tendonitis doing nothing in particular - it was most likely just repetitive strain. It would NOT go away. After about 8 months, I got fed up, went to the doctor, got a diagnosis and threw the kitchen sink at it. Now it's hard to tell what made the difference to finally heal it, but collagen and gelatin were part of my strategy. I had some every day for a long time.

For Canadians living near a Bulk Barn, they sell plain collagen. It's right near the gelatin.

When I made my Phillipina boss feel my crunchy shoulder (I was in her office to tell her my appointment times) she told me to eat meat and broth for the gelatin. I told her, "I'm one step ahead of you!" We had a nice conversation about traditional foods and broths.