b12 injections drug interactions Do You Need a Prescription for Injections? 7 B12 Drug Interactions: Medications
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These needles can be either IM or SubQ

While B12 injections are generally safe, side effects like redness, swelling, or pain can occur

Hong S, Zhai B, Pissios P (2018) Nicotinamide N -methyltransferase interacts with enzymes of the methionine cycle and regulates methyl donor metabolism

This is the practical reason a reader who is nervous about small-volume accuracy might prefer the 50 mg protocol the trade-off being that each vial carries fewer total doses, as the supply math shows next
