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There is limited evidence regarding the relationship between high vitamin B12 levels and blood sugar regulation

The most commonly reported include nausea, vomiting, diarrhea, and constipation

large human trials are not yet

Some may experience minor side effects such as: Redness or swelling at the injection site Temporary soreness or bruising Less commonly, side effects could include: Mild headaches Nausea Itchy skin or rash Should you notice any prolonged side effects, we recommend speaking with your GP or calling NHS 111 for advice

Older adults (there is reduced stomach acid production with age, and acid in the stomach is necessary to absorb vitamin B12)