In skincare, the term oxygenation is used to describe treatments that boost hydration, increase new cell growth and provide soothing benefits. Technically, however, oxidation is the interaction that occurs when substances like metals or living tissue come in contact with oxygen molecules and is eventually responsible for its rust and degradation. This is why a freshly-cut apple turns brown and certain metals left out in the elements rust or turn green. In our skin, ‘oxidative stress’ is one of the most prominent precursors of aging and something we invest heavily in trying to combat.