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Some people ignore tiredness for months before asking for help

While B12 injections are generally considered safe, its important to be aware of potential side effects, which are typically mild and may include: Mild pain or redness at the injection site Temporary itching or rash Diarrhea or upset stomach Headache These side effects are usually short-lived and resolve on their own

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Emily Carter, a registered dietitian and weight-loss specialist at the Mayo Clinic

Masking of folic acid deficiency: B12 supplementation may correct hematological abnormalities associated with folic acid deficiency while leaving neurological damage unaddressed