Over on the Peripheral Neuropathy forum, that's one of the most talked-about supplements ! Go over there and it's either in the 'stickies' or just do a 'search' and you'll get aLLL kinds of good advice......esp MrsD - she has the knowledge to share all the 'ins and outs' of it!
There are certain ones that target pain Re: nerve regeneration....

When I began the Magnesium/B12.....(the list goes on) supplements, that's when I noticed a dramatic change for the better as far as lowering pain spikes and being able to control pain better.....
She emphasizes against the magnesium 'Oxide'.........

check it out, it's a VERY important supplement