Can vitamin b-12-help heal damaged nerves?

Sometimes: If you have pernicious anemia, b-12 injections can reverse much of the nerve issues. If you have diabetic neuropathy, a medical food, metanx which contains b-12, folate, (folic acid) and b-6 in biologically active form can help regrow small nerve fibres. But otherwise, not sure supplements are going to make much difference.

Only: If you are deficient and that that is the cause.