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does vitamin b12 injections cause diarrhea Benefits of Shots Compounded Methylcobalamin (Vitamin B12) Injection,
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[DOI] [PubMed] [Google Scholar] 17.Aparicio-Ugarriza R., Palacios G., Alder M., Gonzlez-Gross M

Symptoms may include hives, itching, swelling, dizziness, or difficulty breathing

The Centers for Disease Control and Prevention has to sign off on the boosters before pharmacies can give them to patients

(2015) "NNMT regulates hepatic nutrient metabolism." Published in Journal of Biological Chemistry
