Unverified90% confidenceFactTime unknown
口服B12吸收依赖内因子，单次吸收上限约1.5-2μg（主动吸收），但高剂量（500-1000μg）时约1%可通过被动扩散吸收，因此纠正缺乏的口服补充剂常设计为500-1000μg而非贴合RDA的2.4μg
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Confidence
Long-term
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