B-12

Vitamin B12 had an antiapoptotic effect and possibly promoted nerve regeneration by inhibiting the apoptosis of damaged neurons and creating conditions for the recovery of nerve function. High-dose vitamin B12 promoted functional recovery of nerves (sciatic nerve) after peripheral nerve injury.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8294980/#:~:text=Vitamin%20B12%20had%20an%20antiapoptotic,the%20recovery%20of%20nerve%20function.&text=High%2Ddose%20vitamin%20B12%20promoted,nerve)%20after%20peripheral%20nerve%20injury.