Dear Ashok, we understand your concern about boosting immunity during this pandemic, COVID-19 is very disturbing situation for the whole world. Organic food is the healthy choice to include in your diet as it is free from harmful chemicals and pesticides with no additives so it contains much more levels of antioxidants which helps in boosting immunity in seniors. A diet rich in vitamins and minerals are good to improve immunity in seniors. You can include organic fruits and vegetables that are rich in beta-carotene, vitamin C & E and even zinc. Seniors can get the nutrients they need from whole foods including legumes, nuts and seeds, whole grains, and even animal protein. Some examples are Broccoli, garlic, ginger, mushrooms, flax seeds, green tea, herbs and spices, yogurt and probiotics, citrus fruits and keep your body hydrated. Hope this helps you, would you like to know anything else?