When adverse effects occurred, they were typically mild and transient, with the most common being mild to moderate headaches (similar frequency to placebo groups), minor injection site reactions (redness, slight swelling), and gastrointestinal effects at higher oral doses (nausea, diarrhea)
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PMID: 19180561
SHIRLEY, NY 11967 PACKAGE LABEL.PRINCIPAL DISPLAY PANEL - 1 mL Container NDC 0517-0031-25 CYANOCOBALAMIN INJECTION, USP 1000 mcg/mL 1 mL VIAL FOR IM OR SC USE ONLY Rx Only AMERICAN REGENT, INC
Poor packaging, storage recommendations, or shipping practices indicate overall carelessness