[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

50岁以上及长期服用二甲双胍、质子泵抑制剂(PPI)者应选甲基钴胺素(methylcobalamin)而非氰钴胺素(cyanocobalamin),且B12剂量建议≥500mcg,因胃酸减少和药物会显著降低B12吸收率

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