Caroline, thank you for that link - it was very interesting.

I agree that eating glucosamine hydrochloride or chondroitin sulfate may help people with osteoarthritis,

However, I disagree with you about UC-II, which seems to a registered trade-name for undenatured collagen. A quick Google shows that there are many comp/alt med sites which offer to sell it.

Eating collagen (it does not matter if it is denatured or not) makes no sense as treatment for osteoarthritis.

A close analogy which may help you;

People with Type 1 diabetes need daily doses of insulin to stay alive. Those doses are delivered by injection. Eating insulin would
be pointless - it would (in the same way as any other protein) be broken down into its amino acids in the gut with no therapeutic benefit. That is why people who need insulin do not eat it.

Eating collagen is just as pointless for somebody with osteoarthritis as it is for somebody with Type 1 diabetes eating insulin.