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[3] [11] Diagnosis should include serum B12 levels interpreted in clinical context, full blood count, and where appropriate, intrinsic factor antibodies and parietal cell antibodies
Studies suggest that peptides purchased from online sources can have substantial impurities and contaminants
B12 absorption will be blocked by smoking and excessive alcohol consumption
The most frequently reported reactions are localized to the injection site and typically resolve within 24-48 hours
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