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People who dont produce enough IF can become deficient in vitamin B12, and are good candidates for B12 shots, says Foxx
Some people dont feel it at all
Since insulin syringes have shorter needles and hold only up to 1 ml of medicine, they are not the perfect syringe to use for Vitamin B12 administration
Signs of an allergic reaction may include hives, difficulty breathing, and swelling of the face, lips, tongue, or throat
Next Steps & Resources: Meet our Experts: Cristina Cicogna, M.D
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