Sunlight is composed of wavelengths from ultraviolet light (UVR) through infrared to visible light. The most harmful to the skin is ultraviolet light, which is divided into three categories dependent on wavelengths: UVA (315–400 nm), UVB (280–315 nm) and UVC (100–280 nm). While UVC is absorbed by the ozone layer and scarcely reaches the Earth, UVA and UVB rays, in addition to their positive effects, can also act negatively on living organisms. UVA penetrates deep into the epidermidis and dermis of the skin. UVB acts mainly in the epidermal basal cell layer of the skin, but is more genotoxic and about 1000 times more capable of causing sunburn than UVA. UVA and UVB rays provoke free radical production and can induce a significant decrease in skin antioxidants, leading to the skin being less able to protect itself against free radicals generated after sunlight exposure. Amongst others mostly singlet oxygen – an excited state of oxygen – is generated, which is a very powerful oxidant with a relatively long lifetime. However, in some reactions a superoxide anion is also produced, followed by dismutation to hydrogen peroxide. Sunlight mainly penetrates different layers of the skin, so they are therefore the most vulnerable to the adverse effects of excessive sun exposure. Chronic exposure to UVR leads to photoaging, immunosuppression, photocarcinogenesis, and the exacerbation of photodermatoses [1], [2] and [3].