Partially Verified65% confidenceDecision RuleTime unknown
备孕及孕早期（怀孕前3个月至孕后3个月）每日推荐补充0.4mg（400μg）叶酸以预防胎儿神经管缺陷；曾生育过神经管缺陷儿或高危人群需在医生指导下增至4mg/天
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65%
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