Type 4 Waardenburg syndrome (also called Waardenburg-Shah syndrome) is characterized by symptoms of Hirschsprung's disease in addition to the classic features of hearing loss and pigmentation abnormalities.
[Effects of a vitamin B complex on functional recovery after nerve injury (author's transl)]. Hasegawa K, Mikuni N, Sakai Y. Functional recovery after nerve crushing was investigated in the following manner: Under pentobarbital anesthesia the sciatic nerve of the rat was crushed at the level of the hip (proximal crush) or the thigh (distal crush).
Other supplements are sometimes used as treatments for nerve pain. There's some preliminary evidence that a few of them -- like acetyl-L-carnitine, alpha-lipoic acid, and gamma linolenic acid -- might help with nerve pain caused by diabetes. However, the evidence isn't clear; more research needs to be done.