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Vitamin B12 injection IV or IM searches are common, but intravenous use should not be assumed unless a clinician specifically directs it

This includes allergy to thiamine or any other B vitamin in the formulation, or to excipients like benzyl alcohol

Fat cell-specific ablation of rictor in mice impairs insulin-regulated fat cell and whole-body glucose and lipid metabolism

Post-injection care is straightforward: Stay hydrated for the remainder of the day Avoid rubbing or massaging the injection site aggressively Apply a cold compress if swelling or soreness develops at the injection site Monitor for signs of allergic reaction (hives, difficulty breathing, dizziness) for at least 30 minutes Contact your provider or seek emergency care if you experience chest tightness, significant swelling, or breathing difficulty Strenuous exercise can resume the same day for most patients, though some prefer to wait until the following morning if injection-site soreness is noticeable