They could be labeled in: Milliliters Units (normally marked Units for insulin syringes) When youre ready, open the package that contains the syringe Then, open the package that contains the needle and screw it on to the syringe Draw air into the syringe by pulling the plunger back to the correct dosage Now, uncap the syringe and set the cap to the side Inject the needle into the vial Flip the needle and vial over slowly pushing the plunger all the way in and making sure the needle is below the surface of the medicine (this decreases the chances of developing bubbles in the barrel of the syringe) Slowly pull the plunger back down, continue drawing the medicine into the barrel until it contains the correct dose (if you notice any large air bubbles, you need to remove them
This can lead to quicker relief of symptoms associated with B12 deficiency
Using expired b12 could certainly result in you not receiving the proper dosage due to deterioration as you now likely suspect given your setback
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