Unverified75% confidenceDecision RuleTime unknown
选购时用『单次成本=单价÷有效剂量份数』横向比价，而非只看总价：一瓶高活力产品若每次只需半片，实际单次成本可能低于看似便宜的低活力大包装
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Long-term
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Unverified看性价比不应只看单瓶容量，应看'有效成分浓度×容量'，部分低价产品靠大量兑水降低成本，实际单次用量翻倍，折算下来更贵87% similarUnverified按‘单次用量成本’而非‘单瓶价格’横向比较：用瓶身标注的推荐用量除以容量，浓缩款单次可能5-10ml、普通款30-40ml，浓缩虽单价高但单次成本反而低85% similarUnverified大瓶装单毫升成本远低于小支独立包装，但开封后保质期极短，核心权衡是经济性与用量匹配：用量大则划算，用量小则实际浪费反而更贵85% similarUnverified计算真实性价比要看每100ml单价而非总价，同时区分'原装瓶'与'补充装'——补充装（袋装）通常比瓶装划算30%以上，长期用建议'买一次瓶+多次补充'85% similarUnverified选购时看'每份剂量'而非'每瓶总量'，部分产品用小规格片剂拉高片数制造性价比假象，应按每100mg维C的单价横向比较85% similar
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