You had better warn Dr Fauci, who says he takes 6000 IU of vitamin D-3 every day, along with a not-yet-revealed amount of vitamin C.
My impression is the big drug companies are terrified of vitamins D & C, which have the potential to drive them out of business, so they subsidize the publication of elaborate lies. Enough vitamin C will apparently cure ANY acute viral infection, as was published in 1949 by Dr Fred Klenner, and never refuted by anyone. Inexpensive nebulized hydrogen peroxide is also highly effective against all upper respiratory infections, including the Wuhan virus, as publicized by Dr Thomas E Levy MD,JD in his free ebook https://rvr.medfoxpub.com/
good luck