Unverified85% confidenceDecision RuleTime unknown

物理防晒需在出门前15分钟涂抹并保证足量（约1mg/cm²，全脸约一枚硬币量），涂太薄会使实际SPF大幅衰减

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儿童防敏隔离霜category

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Unverified防晒需在出门前15-20分钟涂抹以形成保护膜，且用量要足（面部约一元硬币大小/1.25ml），用量不足会导致实际SPF大幅下降，涂太薄的SPF50实际可能只有SPF20的效果89% similar Unverified防晒达到标注SPF值的前提是每平方厘米涂2mg，即全脸约需一元硬币大小（约0.8-1g）用量；实际用量普遍不足，导致实际防护力大幅下降，需足量涂抹84% similar

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