After being diagnosed with trigeminal neuralgia I read that all our nerves are coated with an insulating fat, myelin. It is continually maintained with vitamin B12. Only obtained by eating plenty of animal proteins.
Sadly for many, alcohol reduces absorption of B12.
I am now symptom free and taking 20 micrograms METHYLCOBALAMIN every few days. We need no less than 4.5 micrograms daily. Grazing animals get enough because foliage is coated with soil dust. Cabalamin (B12) is made in soil by COBALT loving bacteria. Our vegetables are washed. CABA stands for COBALT. Get it!
Good luck , James NZ.