Unverified85% confidenceDecision RuleTime unknown

缓释型（Time-Release）维生素C能延长血浆浓度维持时间，单次摄入500mg以上时吸收率优于普通片剂；普通剂型单次超过200mg后吸收率开始明显下降，多余部分经尿液排出

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维生素C补充剂category

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Unverified维生素C每次摄入超过200mg后吸收率急剧下降，单次1000mg吸收率不足50%，缓释剂型或分次服用比单次大剂量更有效85% similar UnverifiedB族维生素为水溶性，服用后1-2小时内血药浓度达峰随即经尿排出，缓释(time-release)剂型可延长吸收窗口，适合需要稳定供给的高压/慢病人群83% similar Unverified维生素C日剂量建议200-500mg即可饱和血浆浓度，单片VC＞1000mg的产品超出吸收上限，多余部分随尿排出，属营销噱头79% similar

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