Some sensitive patients may benefit from microdosing (below 0.25 mg) or customized compounded formulations to improve tolerance
Preferred Injection Sites and Techniques The deltoid and gluteal muscles are often used for B12 injections
doi: 10.1002/9780470514658.ch12 [DOI] [PubMed] [Google Scholar] 129.Baker MA, Maloy WL, Zasloff M, Jacob LS
These may include but are not limited to: Pain or swelling at the injection site Allergic reactions (extremely rare) If you experience any concerning side effects, contact your healthcare provider immediately
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Oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less in people with low intrinsic factor, atrophic gastritis, or gut absorption issues