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Fact : No, there are other food items, including protein-rich items that naturally boost the immune system. Case in point, poultry food items, like chicken. Indeed, people can gain the benefits of zinc from this protein; this helps reduce inflammation. Also, it is rich in vitamin B6, which supports healthy RBC growth in the body. Moreover, people can gain important immunity and gut-health boosting nutrients when they consume chicken bone-based broth.