Vitamin D, Omega-3, and Combination Vitamins B, C and Zinc Supplementation for the Treatment and Prevention of COVID-19

Positive SARS-CoV-2 Test group (Target enrollment: N=1,800) NUTROVID Treat Trial: Adult men/women recently diagnosed with COVID-19 (positive PCR test for SARS-CoV-2 coronavirus) within \<=5 days of symptom onset; and satisfying one of these risk factors: \>=50 years old; or Diabetic \& \>=40 years old; or Obese \& \>=40 years old. Negative SARS-CoV-2 Test group (Target enrollment: N=1,800) NUTROVID Prevent Trial: Adult men/women recently tested negative for COVID-19 (negative PCR test for SARS-CoV-2 coronavirus); and satisfying one of these risk factors: \>=50 years old; or Diabetic \& \>=40 years old; or Obese \& \>=40 years old. Signed Informed Consent Form Exclusion Criteria: * Patients requiring immediate intubation or deemed likely to die within 48 hours. * Patients deemed likely for transfer to an ICU within 48 hours. * Patients currently taking oral corticosteroids for any reason at the time of presentation for care. * Patients included in any other interventional trial. * Uncontrolled bacterial superinfection. * Severe chronic kidney disease (stage 4) or requiring dialysis (i.e. eGFR \< 30). * Pregnant women or women who are breastfeeding. * Immunocompromised patients. * Any patient with recent treatment (past 30 days) of immunosuppressive agents including (but not restricted to) DMARDs, corticosteroids, antibody therapy, intravenous immunoglobulins etc. * Patients with acute myocardial infarction.