forget the tears they cause because onions are a great help against diseases, providing great benefits to the body and adding flavor to food. some of the incredible health benefits of onion: the phytochemicals of onions enhance the effect of vitamin c on the body, ie increase immunity. forget the tears they cause because onions are a great help against diseases, providing great benefits to the body and adding flavor to food. some of the incredible health benefits of onion: the phytochemicals of onions enhance the effect of vitamin c on the body, ie increase immunity. the onions contain chromium that helps regulate blood sugar. for centuries, onions have been used to reduce inflammation and heal infections. do you like onion rings in food? if yes, you can be happy because raw onion encourages the production of good cholesterol (hdl), thus maintaining a healthy heart. the powerful quercetin found in onions is known to play a significant role in cancer prevention. was bitten by a bee? apply onion juice to the area for immediate relief of pain and burning sensation. the onions expel free radicals, reducing the risk of developing gastric ulcers. the green tops of onions are rich in vitamin a, so you should take advantage of them whenever possible.