Supplements Last Updated: February 11, 2021 Summary Recommendations Vitamin C • There is insufficient evidence for the COVID-19 Treatment Guidelines Panel (the Panel) to recommend either for or against the use of vitamin C for the treatment of COVID-19. Vitamin D • There is insufficient evidence for the Panel to recommend either for or against the use of vitamin D for the treatment of COVID-19. Zinc • There is insufficient evidence for the Panel to recommend either for or against the use of zinc for the treatment of COVID-19. • The Panel recommends against using zinc supplementation above the recommended dietary allowance for the prevention of COVID-19, except in a clinical trial (BIII). Rating of Recommendations: A = Strong; B = Moderate; C = Optional Rating of Evidence: I = One or more randomized trials without major limitations; IIa = Other randomized trials or subgroup analyses of randomized trials; IIb = Nonrandomized trials or observational cohort studies; III = Expert opinion
https://files.covid19treatmentguidelines.nih.gov/guidelines/covid19treatmentguidelines.pdf
其中自298页起，为关于VC、VD、Zinc的章节，很详细，很长。总结部分如下
Supplements
Last Updated: February 11, 2021
Summary Recommendations
Vitamin C
• There is insufficient evidence for the COVID-19 Treatment Guidelines Panel (the Panel) to recommend either for or against the use of vitamin C for the treatment of COVID-19.
Vitamin D
• There is insufficient evidence for the Panel to recommend either for or against the use of vitamin D for the treatment of COVID-19.
Zinc
• There is insufficient evidence for the Panel to recommend either for or against the use of zinc for the treatment of COVID-19.
• The Panel recommends against using zinc supplementation above the recommended dietary allowance for the prevention of COVID-19, except in a clinical trial (BIII).
Rating of Recommendations: A = Strong; B = Moderate; C = Optional
Rating of Evidence: I = One or more randomized trials without major limitations; IIa = Other randomized trials or subgroup analyses of randomized trials; IIb = Nonrandomized trials or observational cohort studies; III = Expert opinion
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特别是在疫苗被认可之前。
美国卫生领导机构过于严谨保守。一般而言是好事，但对于突如其来的未知传染病可能是坏事，最先进发达的国家死了太多的人。
或者说随你便，除了锌随便吃？
比如，
缺VC的人补充VC后，免疫力正常了，就说服用VC能抗新冠。
缺VD的人补充VD后，免疫力正常了，就说服用VD能抗新冠。
其实都不具有普遍性。
再比如，人群中可能有30%的人缺VC, 于是，在试探治疗新冠的药物时，就发现吃VC能使30%的人病情好转，于是就说，用VC辅助治疗新冠，有效率能提升30%，等等。 其实，对不缺VC的人来说，再多吃多少都没用。
记得是数千病例。
VC具有强大的抗病毒作用，只是用量需要超出常规很多。
我已经在自己身上试了，绝对有效。所以我才不打“新狗疫苗”呢。
声明：非医生，不推荐其他人用。