Onions possess enormous anti ageing benefits. The antioxidant vitamins A, C and E fight against the damage caused by harmful UV rays as well as prevent free radical damage which is responsible for causing premature ageing of our skin. Onion is one of the richest sources of quercetin, the most powerful antioxidant that can keep your skin wrinkle free. Vitamins and sulphur, on the other hand, protect your skin, and keep it soft and supple. The anti ageing qualities of onion can be attributed to the presence of sulphur rich phytochemicals.