can b12 injections have side effects

https://lookaside.fbsbx.com/lookaside/crawler/media/?media_id=508022988502160 waters Size:100 mcg/ml - 1 box (10amp. x 1ml) Intramuscular injection, by contrast, delivers the peptide into densely vascularized muscle tissue, causing faster absorption and a shorter, sharper peak Vitamin B12 Injection Self-Administration

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