Staying away from the cause of the allergy such as dust as well as exercise regularly can both help reduce the chance of having allergy. Fruits and vegetables with high vitamin C such as guava, puree, kiwi, chili pepper, Chinese broccoli, and cabbage are ideal. Recent research and studies have found that beta-glucan found in Lingzhi mushrooms is even more effective than vitamin C as it helps strengthen the macrophage white blood cells which can fight off all kinds of diseases and allergy-causing particles and does not cause the immune system to overwork. Once the immune system functions properly, allergy problems are bound to go away.