Onion has been a very useful vegetable for human. The organic molecules present in onion are extremely diverse and exert numerous pharmacological pathways to prevent diseases. Although, mechanism of action of the compounds present in onion has been investigated, clearly there remains enough scope to study this subject further. In general, many scientists believe that the medicinal values of onion are because of a series of oxidation processes of the molecules present in it. As result of the medicinal importance of onion, the cultivation of this vegetable around the world has been increased.

Spices; Onion; Oxidation; Organic compounds; Sulfur