Micronutrients, vitamin c, and zinc are critical for a well-functioning immune system. But, these sole supplements are unlikely to prevent COVID-19.
Studies have shown that zinc supplements could decrease COVID-19 related symptoms like lower respiratory tract infection. A research article published on the NCBI website speculates that Zinc can prevent COVID-19 due to its antiviral effects. But there is no evidence regarding the same.
For infectious diseases, vitamin-c is a protective cover and, its supplementation would support respiratory defense mechanisms, prevent viral infections, and reduce their duration and severity. Patients with acute respiratory infections have indicated decreased plasma vitamin-c concentration. This necessary protective action makes it a target of interest in COVID-19.
Currently, there are no medicines or vaccine for COVID-19, according to the World Health Organisation (WHO). Recent evidence has shown that nutritional supplements play a supportive role in COVID-19 patients. Nutrients such as zinc, vitamin-c, and d, along with omega-3 fatty acids administered to the patients, benefited from reduced COVID-19's impact and decreased hospitalization length. In Myth Busters, the WHO states that no meals or supplements can cure or prevent COVID-19, and it suggests maintaining a good diet for general health.
A balanced diet with fruits, vegetables, and whole grains helps to maintain a healthy immune system. Supplements on the market might help the improvement of immune health. However, although these supplements may provide a small benefit for immune health, they should not be used to replace a healthy lifestyle. Moreover, the intake of any vitamin supplement must be under the guidance of a healthcare provider.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.