Onions are known to be rich in biotin. Most of the flavonoids which are known as anti-oxidants are concentrated more in the outer layers, so when you peel off the layers, you should remove as little as possible. Onions, like garlic, are also rich in sulphur compounds. Onions are known to contain manganese, copper, Vitamin B6, Vitamin C and dietary fibers along with phosphorus, folate and copper.
Onions are known to have antiseptic, antimicrobial and antibiotic properties which help you to get rid of infections. If a piece of onion is inhaled, it can slow down or stop nose bleeding. Those who have sleeping disorders or insomnia can have a good night sleep if they have an onion every day. Onions also help to improve the functions of the digestive system; because it releases the digestive juices and cures any problem related to digestion.