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But,some side effects can be serious

Food and Drug Administration (FDA)

This depends on your goals and B12 levels

Self-diagnosing and getting shots without clinical proof is not just a waste of money

In rare cases, some people might have severe side effects like: Skin rash, itching, or hives Swelling of the face, lips, or tongue Chest pain or tightness Blue tint to the skin Difficulty breathing or wheezing A swollen, painful area on the leg Dizziness If you experience any of the above side effects, reach out to a healthcare provider immediately

(19) Gastric surgeries: If a portion of your stomach has been removed, the body cant produce enough IF, and the amount of space for B12 to be absorbed is also reduced