CRPS causes a great deal of stress on th body from pain but also from the consequences of having chronic pain and loss of work etc. Stress causes oxidation and the release of free radicals. Free radicals can cause heaps of problems. It is advisable I think to eat well and consume a diet high in antioxidants to deal with free radicals. Getting them in diet is preferable to suplements in order to get a balance.
I klnow this does not directly answer your question but I hope it helps with understanding about how to minumize the damage.

jeisea
http://www.crps-rsd-a-better-life.blogspot.com