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The Allium cepa l which an onion specie, it is found in Africa,Asia and North America. They are usually horticultural plant in nature,which are accepted by different culture and societies of the world, which include all classes of foods. However, onion can last long because of it versatile nature.it can be said that onion add value to the body through chemical process, onion has two chemical group which include flavonoids and the alkyl cysteine sulphoxides.it has a lot of nutrient such as vitamin c,vitamin B6,carbohydrate and manganese and vitaminB9 which are good for the human body. Furthermore, the health benefits of onion, it has the ability to prevent cancer,to boost immune system, for stomach pains,it is used to strengthen sexual desires and to improve and regulate the sugar blood level.