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However, some individuals may experience: Mild pain or discomfort at the injection site Nausea or upset stomach Mild fatigue In rare cases, more serious side effects may occur, including a rapid heart rate, breathing difficulties, or allergic reactions

In addition, freezing them is also not recommended, as temperature extremes are known to compromise sterility

Those with confirmed deficiency may require parenteral (injectable) B12, as oral supplementation may be inadequate

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