Alpha Lipoic Acid (in 300mg or 600mg capsules)
Used in Europe for years in treating PN (especially early stages)
Some say its acidic to the tummy-tum-tum, but I've never had any problems.
I take 600 in the a.m. Some say 300 a.m. / 300 p.m., others say 600 a.m. / 600 p.m., some say 600 once a day, some say........
just take 600mgs a day for about 6 months and see what happens.
(cheaper at iherb than at the drug stores or health food stores- much cheaper)
My neuro says......" ...can't hurt !!"
(and he's the head of the dept of Neurology at Johns Hopkins)

It should help, and can halt progression......some say......!!