Choosing wisely: needle length and gauge considerations for intramuscular and subcutaneous injections Ulove Prs 12 Pack 1ml Industrial Syringes with 25Ga 1 Inch Needle, Plastic Disposable Syringe and needle for Scientific Labs, Liquids Refilling and Measuring : Industrial & Scientific Amazon.com 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 Vitamin B12 Injection Dosage for Adults: 7 Key Facts & Guidelines Liv Hospital Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide 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