can vitamin b12 injections have side effects Shots And How To Treat Them B12 Shots: Vitamin B12 Injections
Description
Vitamin B12 deficiency that is allowed to progress for longer than 3 months may produce permanent degenerative lesions of the spinal cord

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Cells that would have died continue functioning
Daguenet E, Louati S, Wozny A-S, Vial N, Gras M, Guy J-B, et al

doi: 10.1530/eje.0.1390552
Free B12 has a half-life of 6 days
