So-called free radicals are oxygen-containing molecules that are dangerously unstable because they are missing an electron in their chemical structure. In their “search” for the missing electron, the free radicals act extremely aggressively. The next best intact molecule in the body is simply “robbed” of the required electron. This “electron theft” is called oxidation. If the oxidations in the body’s cells exceed a tolerable level, so-called oxidative stress occurs. The cells are damaged, which can lead to various diseases. Our skin, for example, is also permanently exposed to free radicals, which lead to oxidative stress and can thus promote premature skin ageing and blemishes.