Ping her to this if investigating Guaifenesin: http://web.mit.edu/london/www/guai.html
I tried Guaifenesin and the pain in my knees is gone. Shoulder pain also. It was not arthritis but unspecified joint pain.
I take 2 to 4 tablets a day.
Available over the counter at Wal-Mart for $8.50 per bottle of 20 caps brand name - Musinex.
I read the article at the link you provided and found it interesting but it brings up another question to me. The article mention kava kava. I haven't seen that on the market in a long time. Do you know if it was removed and if so, what was the reason?