The human skin is a complex and multifunctional organ that protects the body from external physical, chemical and infectious attacks. It is not only a barrier shielding of the human body from extrinsic factors. It also functions as a sensory organ, prevents the organism from losing water through evaporation and is the site of immunological defence mechanisms and biosynthesis (e.g. of vitamin D3). In order to fulfil its various functions, a good skin health is important. An essential indicator of the skin’s health condition is its visible appearance. A firm, youthful-looking skin with a radiant complexion and natural warm glow is not only a desirable feature of beauty, but also indicates a good state of health. However, intrinsic and extrinsic influences like lack of sleep, a poor nutrition, stress, air pollution or solar radiation can cause the skin‘s radiance to fade. Both factors promote an overproduction of reactive oxygen species (ROS) and lead to a state of oxidative stress, a major cause of skin damage and premature skin ageing [1].
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