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While B12 injection side effects are rare, some individuals may experience mild discomfort or redness at the injection site
Reach out to your doctor right away if you experience: Hives Itching Rash Swelling of the lips or throat Difficulty breathing Skin issues In addition to injection site pain, you may notice flushing or redness of the face or acne flare-ups
McLean E, de Benoist B, Allen LH
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If your vial has been left out of the fridge for an extended period, its potency may be compromised
Tiny bumps on your tongue called papillae start to waste away
