Medicinal Uses
The onion was used to relieve headaches and hair loss in ancient times. Today, scientific studies show that it is effective against the common cold, diabetes, and various other diseases. Onions also help the body make more effective use of vitamin C and insulin. Onions have been shown to lower high cholesterol and high blood pressure like its relative, garlic.
Other Factors
The sulfuric acids are the agent which gives the onion its smell. It also irritates eyes, as the gas diffuses in air and eventually reaching the eye, causing irritation.
