(2022) Vitamin B12: A review of clinical use and efficacy
The nervous system is a sophisticated complex of nerves, brain, and spinal cord responsible for regulating all vital mental, physical, and cognitive functions of the body
If fatigue is severe, sudden, or unexplained, bring it to your clinician B12 is one possible factor, but it's not the only one worth ruling out
If you have a temporary deficiency or increased requirement (say, after a surgery or during recovery from an acute illness), you might only need a short course, perhaps a few weeks of injections, until your vitamin levels normalize or you can meet your needs by mouth again
Add water slowly down the vial wall
Others include glycine for stability