Onion (scientific name: ALLIUM CEPA) , alias ball onion, onion, jade onion, onion, Dutch onion, leather teeth, etc. , Lily family, onion is a biennial herbaceous plant. Onion contains Prostaglandin A, can reduce peripheral vascular resistance, reduce blood viscosity, can be used to reduce blood pressure, refreshing, relieve stress, prevent colds. In addition, onions can also remove oxygen free radicals in the body, enhance metabolism, anti-aging, prevention of osteoporosis, is suitable for the elderly health food.