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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
They might start with higher doses to fill up their B12 stores
Users often compare them to the kind of headache you get when slightly dehydrated or when adjusting to a new routine
But youve gotta give it time to build up enough B12 reserves first
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