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Using a sterile syringe and needle, your provider will draw up the prescribed dose of vitamin B12 and inject it at a 90-degree angle into the muscle

Too much vitamin B1 (thiamine) might raise it (hypertension), while too much vitamin B2 (riboflavin) might lower it (hypotension)

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Comparison Two body-composition combos, different mechanisms

So the practical takeaway is not oral is better or SC is better. It is: pick one route, follow the documented per-dose figure for the vial you have, and keep the route constant so that whatever you observe is not confounded by a mid-stream route change