https://knowledge.cheeseling.xyz/从产品标签开始，读懂奶粉与维生素。按销售版本查资料，理解成分与计量口径，用透明来源做比较。https://knowledge.cheeseling.xyz/guides/milk-label-checklist/https://knowledge.cheeseling.xyz/guides/milk-label-checklist/同一个品牌名还不够。先把版本、产品类型、规格和比较基准对齐。https://knowledge.cheeseling.xyz/guides/vitamin-serving-size/https://knowledge.cheeseling.xyz/guides/vitamin-serving-size/先找 Serving Size，再读含量。大字号的数字不一定是每粒含量。https://knowledge.cheeseling.xyz/guides/vitamin-d-units/https://knowledge.cheeseling.xyz/guides/vitamin-d-units/维生素 D 的 1 μg = 40 IU。先统一单位，再看产品标签。https://knowledge.cheeseling.xyz/guides/compare-unit-price/https://knowledge.cheeseling.xyz/guides/compare-unit-price/用到手价和相同计量单位比较，避免被大包装和优惠数字带偏。