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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
To back up our quality claims, we also use testing done by a third party that is not affiliated with us and is done in an accredited laboratory
Use of certain medications that may interact with B12 or choline metabolism (e.g., metformin, proton pump inhibitors, or anticholinergic drugs)
doi: 10.1046/j.1365-2125.2003.01907.x
CVS Pharmacy lists B12 shots for $35 on its price list
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