Oranges:
Oranges are one of the best fruits in providing an extra kick to your immune system as there is plenty of vitamin C in this fruit. According to scientists, vitamin C is essential for the body in improving the immune system and is exceedingly helpful in the prevention of the illness from environments such as cold weather. The intake of vitamin C also dramatically helps in lowering the inflammation and other symptoms of infectious diseases and thus boosts the working of the immune system.