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Description
Tell your prescribing doctor if you have any of these conditions, which can increase B12 shot side effects: An allergy to cobalt Kidney disease Severe megaloblastic anemia Side Effects from B12 Shots The most common B12 shot side effect is swelling at the injection site

It really helps with my energy, sleep and overall productivity

Boost athletic performance or improve mood
To maintain optimal stability, keep the pen away from light, and do not expose it to repeated temperature changes

Final Thoughts So, where does that leave the question of how long a B12 shot lasts