Plant-Based Foods That Boost Your Immunity
Onions

Onions and garlic belong to the same family of plants, hence they both contain allicin. Onions are also beneficial for the immune system due to an additional compound called quercetin, a nutrient that breaks up mucus in the head and chest. If you suffer from allergies or circulation problems, or are prone to flu, onions are recommended, as they produce a strong immune effect, protecting your body from such conditions.