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If a headache lasts beyond 24 hours or comes with visual changes or confusion, contact your provider
doi: 10.1080/17843286.2019.1590023 15
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Acute symptoms such as fatigue may improve within days, whilst neurological symptoms like paraesthesia typically require weeks to months of treatment
Safety, Limits, and Caveats The physiological review focuses on normal intrinsic factor function and may not fully address all pathological conditions affecting its production or function
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