Participation in any other clinical trial of an experimental treatment for COVID-19 Critical ill patients that need invasive mechanical ventilation Stage 4 severe chronic kidney disease or requiring dialysis (i.e. eGFR < 30) Patients with past medical history of kidney stone Pregnancy or breastfeeding Documented diagnosis of cancer‎ History of G6PD deficiency ‎and interstitial lung disease ‎ More than 1 gram/day intake of vitamin C ‎supplement in last 7 days

Participation in any other clinical trial of an experimental treatment for COVID-19 Critical ill patients that need invasive mechanical ventilation Stage 4 severe chronic kidney disease or requiring dialysis (i.e. eGFR < 30) Patients with past medical history of kidney stone Pregnancy or breastfeeding Documented diagnosis of cancer‎ History of G6PD deficiency ‎and interstitial lung disease ‎ More than 1 gram/day intake of vitamin C ‎supplement in last 7 days

Participation in any other clinical trial of an experimental treatment for COVID-19 Critical ill patients that need invasive mechanical ventilation Stage 4 severe chronic kidney disease or requiring dialysis (i.e. eGFR < 30) Patents with past medical history of kidney stone Pregnancy or breastfeeding

Participation in any other clinical trial of an experimental treatment for COVID-19 Critical ill patients that need invasive mechanical ventilation Stage 4 severe chronic kidney disease or requiring dialysis (i.e. eGFR < 30) Patents with past medical history of kidney stone Pregnancy or breastfeeding