Hi Sue,
Your link works fine now :-)
Others will chime in but for now take a look at these files and see if they provide you with more insight:
Pain Medication and Alternatives 
Acetyl-L-Carnitine 

Hint: The file folders list in the wiki is a good place to start looking for information so you can become familiar with subjects while waiting for replies to messages. 
:-) 
--

- ​LeeAnne