my understanding on CMO is it is made from cartilage from animals that are immune to arthritis..more info here,
http://www.tldp.com/issue/168/168cetyl.html . I convinced my fam doc to prescribe LDN for me then I had it made at a compounding pharmacy. Waiting list for rhumys in Ottawa is about 6 months and im not sure if they would proscribe as most push NSAIDS or TNF Blockers. Sometimes if you bring your doc research backing the potential benefits of LDN they will prescribe ...especially that 4mg is so little compared to the 50mg the drug is norm made at.
Cheers!