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If you notice signs of anaphylaxisswelling of your tongue, face, or throat, difficulty breathing, or difficulty swallowingafter getting a B12 injection, call 911 or head to the closest emergency room immediately

doi: 10.1002/j.1550-8528.1999.tb00426.x

They must be taken after doctor's advice

This makes it a more targeted and potentially safer option for individuals seeking to lose fat
