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For many people, especially those with certain health conditions, this process doesn't work well
This commonly includes lifelong treatment for pernicious anaemia, managing severe B12 deficiency with neurological symptoms to prevent further damage, and for individuals post-gastric surgery due to impaired absorption
This particular systematic review and meta-analysis looked at the association between insomnia and the incidence of heart attack, also called myocardial infarction (MI)
Taking extra B12 without a confirmed deficiency wont necessarily make you feel more energetic, and pursuing injections without medical need can be unnecessary
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