why b12 injections hurt Vitamin Injection Dose: 7 Guidelines for Safe Treatment B12 Shots in Friso, Sherman,

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FDA's evaluation concluded that the criteria weighed against placement on the list, citing inadequate physicochemical characterization, immunogenicity concerns from impurities and aggregates, lack of clinical effectiveness data for any approved use, and absence of published human exposure data for the proposed subcutaneous and topical routes

Foods rich in vitamin B12 include unprocessed meat, eggs, and dairy products, per Healthline

doi: 10.1038/nature13198

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