Vitamin C protects body functions due to its anti-oxidant properties, and vitamin D enhances immune functions, in high doses.
Both have been extensively used in COVID-19 patients; there are approximately 20 trials listed on "clinicaltrials.gov" which are evaluating the role of these vitamins either alone or in combination with other nutrients/drugs.
Seeking valuable opinions from RG community for improving decisions when advising patients for the intake of these vitamins in high doses.