‘Immunity’ might be the most searched word during the Covid-19 pandemic. Basically, the term immunity is an innate property of human beings, but to sustain this property we need to follow healthy food habits, cleanliness, etc. Covid 19 pandemic proved the importance of immunity & those who do not keep proper immunity, need to take an immunity booster. This immunity booster may be a group of foods, dietary supplements, medicine, health drinks, etc. In this article, our main aim is to discuss how a good immunity system helps to prevent pandemics & review the role of an immunity booster to increase immunity.