"FRUITS THAT WILL BUILD YOUR. IMMUNE SYSTEM " Fruits rich in vitamin C like citrus fruits (oranges, grapefruit, tangerines) and berries (strawberries, blueberries) help your immune system by boosting white blood cell production and fighting infection. Other fruits that build your immune system include papaya and kiwi, both high in vitamin C and antioxidants, and pomegranate and cranberries for their antioxidant and antibacterial properties. Here are some specific immune-boosting fruits: Citrus Fruits: Oranges, grapefruit, lemons, and limes are excellent sources of vitamin C, which supports white blood cell production to fight infections. Berries: Blueberries provide antioxidants to protect cells, while strawberries and raspberries are high in vitamin C and can have anti-inflammatory effects. Papaya: This tropical fruit is a good source of vitamin C and other nutrients that support immune function. Kiwi: Rich in vitamin C, kiwi helps to increase white blood cell production, aiding the body in fighting off infections. Pomegranate: Offers a boost of antioxidants and has been shown to support immune health. Watermelon: A good source of antioxidants and helps with hydration, which is important for maintaining mucus membranes—a natural barrier against germs.