b12 injection side effects Common & Rare of Vitamin Injections how long do b12 injection

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After receiving a B12 injection, many people report feeling an immediate boost in energy levels and mood

Some people report varying levels of pain and stinging sensations, and some report no pain at all

And never inject into a mole, scar, bruise or broken skin

Common, mild side effects: Pain, redness, or itching at the injection site Mild nausea or diarrhea Headache Temporary dizziness Rare but more serious reactions: Allergic reactions (rash, swelling, breathing difficulty) Heart palpitations Low potassium levels during rapid correction of severe deficiency Very rare cases of anaphylaxis requiring emergency care Seek medical attention immediately if you experience symptoms of a serious allergic reaction