Does size matter? Historically, a bigger needle gauge was considered better to prevent damage to red blood cells. However, our recent guidelines recommend using smaller gauge needles (2325 G) for all B12 Injection Dosage and Frequency: 7 Essential Guidelines for Adults Liv Hospital Syringes and Needles Medical Syringes Luer Lock Shop B12 Syringes and Needles Online Buy OTC
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what needle size for b12 injection How to self-inject intramuscular vitamin B12 - Overview