Antioxidants are molecules that fight free radicals in your body.
Free radicals are compounds that can cause harm if their levels become too high in your body, which are linked to multiple illnesses. Free radicals are for the immune cells to fight infections. When free radicals outnumber antioxidants, it can lead to a state called oxidative stress, which can damage your DNA and  other important molecules in your body including cell death.
Within the human body, millions of processes are occurring at all times.
These processes require oxygen. Unfortunately, that same life-giving
oxygen can create harmful side effects, or oxidant substances, which
cause cell damage. Oxidants, commonly known as “Free Radicals” are also
introduced through external sources such as exposure to the sun or pollution.
Other mediums include stress, as well as things that people put into their
bodies such as alcohol, unhealthy foods and smoke. In much the same way
as oxidation creates rust, there is a breakdown of cells inside the human body.
Free radicals produced by this breakdown attack healthy cells. This chain of events weakens immunological functions as well as speeds up the aging process. Antioxidant agents reduce the effect of dangerous oxidants by binding together with these harmful molecules decreasing their destructive power.
Antioxidants can also help repair damage already sustained.
What does antioxidant do for skin?
Your skin is the largest organ, so it is important to take care of it.
Antioxidants protect skin by limiting the production of free radicals, which can damage skin cells.