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不建议为省事只买孕妇综合营养片而忽略孕早期叶酸的关键窗口期，神经管在孕后28天内闭合，应在备孕前3个月即开始单独或确保足量叶酸摄入

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叶酸补充剂category

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Partially Verified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78% similar Unverified备孕选购路径：孕前至少3个月开始每日400μg→无高危史选普通叶酸单方或含叶酸孕期复合维生素→有MTHFR变异/流产史/糖尿病/肥胖者咨询医生升级活性叶酸或提高剂量→孕12周后可继续或转为含叶酸综合营养77% similar

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