needle size for b12 injections in the thigh Gauge Chart Injections! Wondering which needle gauge to use? Here's a handy reference for healthcare professionals! Gauge Sizes and Colors: 14G (Green): 0.072 (1.83 mm) 15G (Amber): 0.065 GMP Medicine, Cyanocobalamin/Vitamin B12 Size:10 mL (1000 mcg / mL) thevet_group
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