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International journal of surgery case reports, 121, 109931

Body composition tracking Scale weight alone is insufficient

If you have additional risk factors, such as a vegetarian or vegan diet (which may be lower in B12-containing foods), a history of gastrointestinal surgery, or certain medical conditions like pernicious anemia, your healthcare provider may recommend monitoring your B12 levels and considering supplementation, including B12 shots if necessary

Someone reads a dosage chart online, draws 25 units, and assumes they injected 2.5 mg

Better Sleep: B12 regulates melatonin levels, enhancing your sleep cycle

Mayo Clin