This is not medical advice. This is a petition to federal and state governments to urgently publish recommendations for vitamin C intake as a prevention measure against COVID-19.
Can vitamin C prevent or alleviate symptoms of acute respiratory tract infections, including COVID-19? (Gorton & Jarvis, 1999) reported 85% decrease of cold and flu symptoms in the test group taking vitamin C, compared with the control group, not taking vitamin C. The test group took vitamin C prophylactically and over the course of disease at 3,000 mg per day (1,000 mg x 3), and an increased dose of 6,000 mg (1,000 mg x 6, hourly) on the first day of symptoms onset. This specific regimen is important: taking a moderate amount of vitamin C prophylactically and during illness, and a larger dose on the first day of symptoms onset.