I tried it for several months with no improvement, so I stopped—the stuff was just too expensive.* I don't recall the brand/dosage; it was a brand known to us, and whatever dosage I found recommended here.

I've had better luck with pantothenic acid (B5) in conjuction with RLA (which doesn't work for everyone either).
http://www.diabeteslibrary.org/View....ntothenic_acid

RLA itself doesn't work for everyone; it depends on the cause/type of PN—some supplements work for some types but not others. That's why we have to try them one at a time to find what works for each of us.

*Same with Triple-Flex (glucosamine/chondroitin/MSM) for arthritis/joints. A lot of people swear by it, and that's great that it works for them, but it doesn't work for everyone. We took it for a few years, then stopped because we realized it wasn't doing us any good, and it was just too expensive too.
http://www.quackwatch.org/01Quackery...ucosamine.html

Doc