side effects too much b12 injections do have Vitamin B12: Is It Bad for Your Health? – Vitamin B12 Deficiency: Causes, Symptoms,

Inclusion criteria were (1) single-level foraminal or lateral cervical disc herniation compromising the nerve root with neurological deficit

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We can all agree that B6 is a possible cause of peripheral neuropathy but based on the limited information here, everything points to the neuropathy being from a B12 deficiency, not a B6 overdose

Cyanocobalamin Cyanocobalamin is an artificial form of Vitamin B12 which the body converts into the active forms of Methylcobalamin and Adenosylcobalamin, ready for use

B12 supplements come in mega doses think 500 mcg or even 1000 mcg per tablet