what size needle to give b12 injections subcutaneous injection Dr. prescribed injections. Pharmacy only gave me vials. Where do you What Size Needle for B12

Clinical data shows all three sites deliver equivalent total drug exposure over the course of a week

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A healthcare professional uses a thin needle to deliver the concentrated B12 solution directly into the muscle tissue, usually in the upper arm or thigh

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If that doesnt help, you can incubate the vial in a lukewarm water bath (no hotter than ~37C unless you know the peptide is heat-stable) for several minutes