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B12 injections are generally considered safe and well-tolerated
Watch for possible symptoms, such as a lump or swelling in the neck, hoarseness, trouble swallowing, or shortness of breath
This can prevent the adverse effects that may come if you have no deficiency to correct
There are currently four types of B12 available: Cyanocobalamin, Hydroxocobalamin, Methylcobalamin, and Adenosylcobalamin but which one should you opt for
Safety and tolerability of the hexadecapeptide AOD9604 in humans. J Endocrinol Metab 3(12):715
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