Unverified85% confidenceTradeoffTime unknown
剂量越高纠正缺乏越快，但也越易过量且更依赖血清监测；不做检测的日常保健选1000-2000IU比盲目吃5000IU更安全，高剂量应作为短期纠正而非长期习惯
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Unverified剂量越高见效快但过量风险大vs剂量常规更安全——除医生诊断缺乏外，普通预防补充坚持400IU即可，切勿自行加量87% similarUnverified剂量越高越接近药物级但吸收边际效益越低，日常保健应选低剂量高频而非高剂量低频；治疗性大剂量（如免疫支持1000mg）应为短期疗程而非长期87% similarUnverified剂量越高单次省事但过量风险与个体差异越大；小剂量（1000IU）每日服用更利于稳态维持，适合长期无检测的保守补充策略85% similarUnverified剂量与安全的权衡：5000IU纠正缺乏见效快但需监测，1000-2000IU起效慢但可无监测长期服用，无检测者优选低剂量84% similarUnverified剂量与吸收的权衡：高剂量（5000IU）省事但个体差异大易过量，低剂量每日服用（1000-2000IU）血药浓度更平稳，非缺乏人群优先低剂量常规补84% similar
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