b12 injection versus oral vs. Supplements: Which One Do You Actually Need? – ELLEMES Medical Spa Oral vs. Intramuscular Vitamin B12
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Plus, they can enhance mood and mental focus

You might feel bloated, have mood swings, or notice breast tenderness

Apr 2023;37(2):363-377

Among others who might consider B12 injections are those who suffer from pernicious anemia, due to their difficulty maintaining proper red blood cell counts

Underventilation or apnea due to unintentional subarachnoid injection of local anesthetic solution may produce these same signs and also lead to cardiac arrest if ventilatory support is not instituted
