Shop B12 Syringes and Needles Online Buy OTC Medsitis' Guide To Syringes & Needles. For subcutaneous injections, using shorter needles (4 5mm) is the safest choice to ensure medication stays in the fatty layer and avoids muscle injury. A 4mm needle is ideal, minimizing pain while keeping Ivy Grove Surgery : Self administration of B12 injection
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best needle size for b12 injections How to self-inject intramuscular vitamin B12 - Overview