The MS community has been using various nutritional supplements for years, to aid in remyelination of damaged nerve axons with some success.

Also nutrients that support mitochondrial activity in damaged cells can help with nerve damage, and many with peripheral neuropathies benefit. Terry Wahls MD improved her MS with just food --and wrote a book about it--Minding your Mitochondria. She has a TED lecture online.

The FDA requires studies to allow ADVERTISING of OTC products including nutrients however. A good example is SAMe which is allowed to put on its label, that it aids in 3 ways for healing. (joint, liver and mood). There were many studies in Europe with SAMe before it came here. Salonpas arthritis strength patches also got a nod to allow on their label that they work for pain. Nutrients however in US do not need studies to be available for sale. They just cannot advertise what they are intended to treat, on the labeling, and cannot claim "cures".

Nutrients usually do not have the backing of $$ to provide studies however. But some doctors still use and recommend them. Dr. Blaylock MD has used supplements in his practice for many years (he is a retired neurosurgeon). He has a website and newsletter with his recommendations.

When there is any nerve damage however the use of the word "cure" is inaccurate IMO. We can improve but I think cure is out of reach. And certainly the drugs given by RX do not provide any potential for healing at all. They are only symptomatic relief.

And there are some drugs that actually BLOCK healing or remyelination of nerves. Statins used for cholesterol have been shown to actually damage and kill nerve cells. There are photomicrographs now published about this damage and articles like this one.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2671276/