Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium What size gauge needle is needed for vitamin B12 (cobalamin) injections? Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide Types of injections explained Intramuscular (IM) Inserted at 90 to deliver medication deep into the muscle, allowing relatively fast absorption due to rich blood supply. Subcutaneous (SC) Inserted at about 45
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