I read the worst case scenario with the large doses of vitamin c is kidney stones so drink lots of water. I'll continue to use it and take my chances. I did research it on google and researchers in china see the same benefit as with a common cold, not as severe and goes away sooner, possibly causing less lung damage.
I had no problems in the 90's and 15 years ago with high doses of vitamin C during a few years. It helped me quit smoking twice. It can be a personal thing. No problems for me.
I have also read about kindney stones. But today I'll prefer to not get infected.
If letting those small invaders in they will multiply and attack the lungs if giving them the chance.
I believe in building up my body's strenght against infections and viruses with help of eating correct and additional vitamins.
The Chinese experiences of vitamin C building up the strenght to not catch COVID-19 fits my experience of it.
It's not expensive, no commercial for a specific expensive product someone want to sell and make money.
Ascorbic acid the cheapest alternative.
Those with kidney stone risk might eat what they can. I read that 1 gram/day will not cause problems for stone risk people. Better than nothing.
Vitamin D can not be taken in too high doses since it's a fat solved vitamin that accumulate in the body as A and E also do.
B and C will be flushed out naturally.
This is like get our old bikes to work as good as possible. Bikes that are young compared to us
