And this wouldn't be called as a "successful treatment" if it is only one case, you would have to prove this in other cases because it is possible that the treatment wasn't successful. And like JSS says with his palm example, just because it kills viruses in a test tube, it doesn't mean that inhaling it in our body will treat it. We'll just have to wait for the vaccine and also follow social distancing orders.
Woah, who said anything about inhaling vitamin C?
Regardless whether it directly treats COVID, or any other virus, it will not harm you with a typical dose, and will help your immune system.
I agree with your assessment here and I didn't mean to "inhale Vitamin C (my bad for not explaining myself as clear as possible)"

because there have been studies that it can boost the immune system; I don't agree with people who claim that it will treat with pandemics despite no fully assessed- evidence. Like Kenneth Copeland claiming that praying with him will get rid of the coronavirus.