Boosting the immune system with functional compounds during the COVID-19 pandemic: a review

Background: More than 1 year has passed since the outbreak of the COVID-19 pandemic. Nutrition and its role in boosting the immune system have been a hot topic during the previous year in the light of the COVID-19 pandemic. An effective medicine for COVID-19 has not been introduced and public vaccination has not gained an acceptable speed in the world;therefore, preventive measures, protocols adherence, and a robust immune system are crucial. The aim of this study was to evaluate the role of food in boosting the immune system during the Covid-19 pandemic.