how much b12 can you inject daily to self-inject intramuscular vitamin - Overview Vitamin B12 Dosages: Your GoodRx
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Invert the vial (turn it upside down) and pull the plunger back to draw your prescribed dose into the syringe

This is not inherently dangerous

However, these side effects are temporary and will subside quickly

In some instances, applying a cold compress may relieve the pain