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B12 Injection Frequency: How Often Should You Get a Shot? Dr. prescribed B12 injections. Pharmacy only gave me vials. Where do you get your needles and syringes? What size?? Where do I inject? : r B12_Deficiency What is the typical syringe size for vitamin B12 (cobalamin) injections? How Long Does It Take for B12 Shots to Work Fast? Best Vitamin B12 Injection Sites MedHealth 360
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