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CDC flags one specific mistake here
Always allow vials to come to room temperature before opening to reduce condensation, and avoid repeated freeze-thaw cycles
Certain fortified foods like cereal contain B12 as an additive
Call your doctor if you experience any of the following symptoms: Headache Nausea Drowsiness Numbness Tingling in the arms and/or legs Seek immediate medical attention if you experience any of the following: Rash Itching Swelling Severe dizziness Trouble breathing Storage Store at controlled room temperature
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