Studies have suggested that the UVs components of the solar spectrum induce photo-oxidation of skin surface lipids, squalene and cholesterol, resulting in their degradation. In addition, UVs lead to oxidative stress.
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If sunscreens protect against UV radiations, several studies point now the deleterious impact of infra-red (IR) and the fact that an IR protection should also be added to the products [1-3].
Today, it is well known that UV radiation is responsible of various harmful responses at the cutaneous level. UV rays generate reactive oxygen species and are a source of oxidative stress.