Raw onion is known to lower the production of LDL (bad cholesterol) and keep your heart healthy. The Vitamin C (which remains intact while they are in the raw form) along with the phytochemicals present in onions helps build immunity. Quercetin, a powerful compound found in onions, has been suggested to play a role in preventing cancer, especially stomach and colorectal cancers. Chromium, also present in this root vegetable, may help regulate blood sugar. A mixture of onion juice and honey (which helps make it less pungent) is said to be effective as a cure for fever, common cold, allergies, etc. Keep a small piece of onion under the nostrils and inhale, to stop or slow down a nose bleed. Folate in onions also helps with depresseion and aids sleep and appetite. The vitamin C helps formation of collagen that is responsible for skin and hair health. Antibacterial and anti-inflammatory properties of onions have been proven. One study also suggested that freshly chopped raw onions have these anti-bacterial properties, not chopped onion which has been allowed to sit for a day or two. Chewing raw onions improve our oral health (though your breath may stink). They help eliminate bacteria that can lead to tooth decay and gum issues.