According to WebMD, The more common B12 injection side effects are: Swelling at the injection site Mild dirhhea Itching Swelling in the body Low potassium (weakness, irregular heartbeat) There is a case report of an anaphylactic reaction to a B12 injection in a 55 year old women receiving cyanocobalamin, but these reactions are thought to be rare
It is available as an oral dietary supplement in tablet form, or doctors can also prescribe it as a shot
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Potential Side Effects Injection Site Reactions: Redness, swelling, tenderness, or mild pain
But for the person who wants to support their antioxidant defenses, liver health, immune function, and cellular vitality on an ongoing basis, sublingual delivery is the more effective choice in practice