mayo clinic b12 injection how often Compounded Cyanocobalamin (Vitamin B12) Cyanocobalamin Injection - Cleveland Care

B12 injections are suitable for individuals who: Experience chronic fatigue or low energy

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This vitamin is the largest and most complex vitamin we know

At 3.33 mg/mL, 1 unit = 0.01 mL 33.3 mcg

Serum vitamin B12 concentrations below 148 pmol/L (or 156 pmol/L in certain studies) are commonly considered to suggest a frank deficiency [26,27,28,29,30]

I have gotten the shingles vaccine, also MMR & Tdap boosters without serious side effects (except for a frozen arm for 1 week after the Tdap), but I once had a long term reaction to a flu vaccine which caused shortness of breath for many months