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Best Needle For B12 Injections (Size & Gauge) PA Relief Can I use a 1 inch needle for injections with 21 gauge? What size gauge needle is needed for vitamin B12 (cobalamin) injections? Is It Okay To Use A B12 Injection With Insulin Syringes? Needle Size for a B12 Injection: A Simple Guide CoLaz what gauge needle size syringe for B12 injections (dosage of .8 for my pup)?
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