Hi Mrs D.
Here is a link to the article I read on Amino Acids and diet in Chronic Pain Management.
http://www.dynamichealthresources.co...s_april_09.pdf
I'm also thinking of supplementing with the 20 amino acid chain recommended in this article. I find this all quite interesting.
As for the cats diet I think he'll be quite happy with even a bit a taurine sprinkled on his shrimp. I sprinkle a small amount of lysine on his food when life gets a bit stressful around here, like when the repair guys come into the house rattling all their tools
Warm wishes.
MsL