There's controversy in the news whether or not added Vit C can help build your immune system against Coronavirus. There's also concern that taking too much Vit C can lead to kidney stones.
Check with your doctor to see what's right/best for you.
"And note, too much vitamin C can cause kidney stones in some people." **
**Dr Max Gomez; Max Minute: What’s The Deal With High-Dose Vitamin C Helping Ward Off Coronavirus? March 25, 2020