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Most users and clinics report 250 mcg twice daily (morning and evening) or 500 mcg once daily
The exact cause matters because some absorption problems are persistent, while others may be treatable or need specialist review
Try keeping track of exactly how much vitamin B12 you are consuming on a weekly basis and promptly consult your primary care physician if you start experiencing any adverse symptoms, like trouble sleeping at night or gastrointestinal discomfort you might want to lower your dosage if nothing else but your weekly vitamin B12 consumption has changed
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