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B-12 injections are commonly used to combat fatigue, brain fog, and mood swings

Due to this Vitamin B12 does not get absorbed, as the intrinsic factor is responsible for vitamin B12 absorption

Another mechanism that B12 boosts energy is by its contribution to red blood cell formation

Cochrane Database of Systematic Reviews, (3)
Have read that oral manifestations are also a symptom of having COVID19 virus, so I surmise vaccine side effects are not unusual