Onion  is a plant that is grown worldwide. The onion bulb is commonly eaten as food. Onion bulb and extract are also used to make medicine.
Onion is commonly consumed in foods. As medicine, there isn't enough reliable information to know what an appropriate dose of onion might be. Keep in mind that natural products are not always necessarily safe and dosages can be important.


Onion contains chemicals that seem to reduce swelling and lung tightness related to asthma. It also contains chemicals that seem to reduce cholesterol and lower blood sugar.

People use onion to prevent scarring. It is also used for obesity, hair loss, asthma, insomnia, high blood pressure. Warts, and many other conditions, but there is no good scientific evidence to support these uses.