IV Vitamin C reduces mortality in Acute Respiratory Distress Syndrome patients
jamanetwork.com
jamanetwork.com
See Figure 3 on page 1268.
As an anecdote, I've been experiencing symptoms in-line with COVID-19, mostly sore throat and intense fatigue. I've been using liposomal Vitamin C at 30-50g per day with great improvement of symptoms. I generally dose every 3 waking hours. If I wait too long between doses I can feel the fatigue come back, which then reduces shortly after taking another dose.