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).
Vitamin B12 is a crucial nutrient for neurological health, and a shortage of vitamin B12 in the blood (vitamin B12 deficiency) can cause nerve cell damage and destruction, resulting in ailments like chronic pain, numbness, vision problems, tremors, and many others related to your nervous system.