Are there any peer-reviewed studies or trials regarding the effectiveness of LDN for pain relief?
I would refer you to PubMed. If you Google PubMed and then just put in Low Dose Naltrexone pain relief, you'll find a great number of articles, specifically chronic regional pain syndrome, fibromyalgia pain, and nerve pain. There are a number of journals that have been published and those are also available on the LDN Research Trust website.