You are in Drugs and Herbs . It is applied externally for insect bites, wounds, mild burns, warts, boils, and bruises. These folk uses all remain unproven. It's the same ingredient that brings tears to your eyes that lends Onions their ability to fight disease. This sulfur compound thins the blood and helps prevent dangerous clots while lowering blood pressure and possibly reducing cholesterol levels.
Onions also possess the ability to kill a wide variety of germs.
And, for asthma victims, Onion extract may even relieve allergy-induced bronchial constriction. There are no known medical conditions that preclude the use of Onion. Special Cautions Taking large quantities can cause stomach problems. No interactions have been reported. No harmful effects are known.