How to Inject Into a Vein: 13 Tips and Best Practices 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 Vitamin B12 Injections: Benefits, Safety & How They Work what happens when you hit a vein during injection?
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what if i hit a vein injecting b12 What is a collapsed vein? » Ask Our Doctors (by JourneyPure)