[KongchangAI]
Unverified82% confidenceDecision RuleTime unknown

老年人及萎缩性胃炎患者因胃酸和内因子分泌不足,食物结合型B12吸收差,应选择游离型B12补充剂(补充剂中的B12不依赖内因子的部分可被动吸收约1%),剂量建议≥1000mcg/日以确保被动吸收足量

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