In addition, another study showed that onions are full of organic sulfurs, which are known to inhibit a variety of cancers (3).
Cancer ADVERTISEMENT2. Regulate Diabetes
Research suggests that onion extract can lower high blood sugar and improve cholesterol levels.
3. Prevent Ulcers
Eating onions may prevent gastric ulcers by scavenging free radicals and by preventing the growth of Heliobacter pylor (H-pylori)—an ulcer-forming microorganism.
4. Improve Oral Health
Onions are often used to prevent tooth decay and oral infections. Chew raw onion for 2 to 3 minutes and the natural antibacterial properties in onions will kill any germs in your mouth and throat.
5. Boost Immunity
The phytochemicals in onions supercharge your immune system against toxins and various foreign bodies that can lead to disease and illness (4).
6. Treat Respiratory Issues
Raw onion mixed with honey and brown sugar and set overnight, will form a powerful syrup. After 24 hours, remove the onion and you are left with a powerful cough syrup that will help reduce phlegm and congestion.
7. Stop Nose bleeds
Cut a slice of raw onion and put directly under your nose—the acrid fumes from the onion will help to clot the blood. And thus stop the bleeding.