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NUTRITION 6-MIN READ UPDATED MAY 2026 Vitamin B12 After Bariatric Surgery: Why It Matters and How to Stay Above the Risk Line B12 deficiency is the most under-diagnosed long-term complication of bariatric surgery

Same with 2nd also

If you experience persistent headaches, fatigue, mood changes, and other symptoms that dont resolve within a few days, contact your prescribing clinician immediately to assess your condition and prevent possible complications

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The Pernicious Anaemia Society and the NIH B12 professional fact sheet are both reliable places to read further