Purple onion contains more antioxidants than white onion, which is more effective in preventing cancer. Quercetin and allicin in onion have been proved to help reduce inflammation and prevent and treat cancer. The purple skin of purple onion contains more quercetin, which is also a very useful health care component for human body. So the therapeutic effect of purple onion is much better than that of white onion.

Onion, also known as onion, has a history of more than 5000 years as a vegetable. Onion is rich in calcium, phosphorus, iron, vitamin B 1, vitamin C, carotene, nicotinic acid, prostaglandin A, diallyl disulfide and sulfur-containing amino acids, among which sulfur-containing amino acids have the functions of lowering blood fat and blood pressure, and prostaglandin A has the functions of dilating blood vessels, reducing blood viscosity and preventing thrombosis. Onions are also rich in trace element selenium, which can reduce the incidence of cancer. Ordinary adults eat 50-80 grams of onions raw every day, which has a very significant health care effect. It's really a "vegetable queen".