Big Daddy is correct they are currently studying IV vitamin C in china on some Coronavirus patients but AFAIK results aren't final yet:
https://www.medicinenet.com/script/m...iclekey=228745
There's quite a bit of evidence in the efficacy of Vitamin D, Zinc, Echinacea, and vitamin C in increasing resistance to cold viruses and recovering from them quicker though:
http://downloads.hindawi.com/journal...18/5813095.pdf