Vitamin C.

The most common and familiar kind of strong antioxidant, possessing powerful reducing properties, eliminates the toxicity of harmful oxygen radicals through reducing action. It can react rapidly with O2- , HOO- and OH- in the body to produce semi-dehydroascorbic acid, which scavenges mono-linear oxygen and reduces sulfur radicals at the same time.

It is important to note that vitamin C is not only an antioxidant, but can also act as a pro-oxidant under certain conditions.