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The most common side effect of B12 injections is irritation at the injection site, and injections are typically administered intramuscularly or subcutaneously. Less common side effects may include headache, nausea, diarrhea, itching, or a brief feeling of lightheadedness after the injection

Thinning skin, vasculitis, purpuric dermatosis, platelet deficiency, liver disease, vitamin K deficiency, vitamin C deficiency, moving your body during the injection, or dehydration may also cause bruising

Simple chin tucks, scapular retractions, and pec stretches reduce strain

Li W et al., J Pain Res 2020 Methylcobalamin for post-herpetic neuralgia meta-analysis

(20) Other studies still have established no clear link between B12 levels and sleep duration