You may wonder why we pull back into the syringe when giving injections in the vein. This picture explains why. We don't pull back to make sure we're in the vessel, we How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust Injecting B12 Enhance Me Training Academy Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium
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b12 injected into blood vessel Adsorption, blood transport, and intracellular metabolism of vitamin