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Side effects to tell your doctor about immediately are skin rashes, itching, hives, swelling of the tongue, lips, or face, blueish skin, chest tightness or pain, trouble breathing, wheezing, dizziness, or red, swollen, painful area on a leg (via the Cleveland Clinic)

Vitamin B12 Shots vs B12 Supplements When it comes to boosting your Vitamin B12 levels, both supplements and shots can be effective, but there are some differences to consider

Emma M., review from WhatClinic Please note that results vary from person to person due to lifestyle, external and internal factors, and genetic predispositions

Common side effects include mild injection site pain, redness, or swelling

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