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NICE Clinical Knowledge Summaries and British Society for Haematology guidelines emphasise the importance of prompt investigation when clinical features suggest deficiency

Higher quality products with third-party testing and certificates of analysis generally cost more but provide better assurance of purity and potency

Thymosin Alpha-1 (Zadaxin) is an approved drug for chronic hepatitis B (and hep C outside the US) and during cancer chemotherapy induction

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If the reason is less clear, the care team may recommend review of symptoms, outside records, or broader follow-up before turning B12 into a repeating plan

Titrate by 150 mcg weekly