Unverified85% confidenceDecision RuleTime unknown
孕备及孕早期补叶酸应选每日400-800μg剂量，且优先甲基叶酸（5-MTHF），普通合成叶酸摄入过多可能掩盖B12缺乏并有未代谢叶酸蓄积风险
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