I solar cosmetics were created to protect the skin from harmful UV rays .
The skin has natural defenses, such as the stratum corneum and urocanic acid.
The stratum corneum (contained in the epidermis) reflects about 5% of UV radiation . If the exposure is long, the stratum corneum thickens and goes in hyperkeratosis, leading to more reflective capacity.
L ' urocanic acid is produced by epidermal cells after exposure to the sun. It is a substance that can absorb UV radiation by changing molecular conformation, and then release them in the form of heat and return to its initial state (transition from stable trans form unstable CIS, TRANS again ).
The skin also has natural pigments such as melanin , produced by melanocytes in the basal layer of the dermis.
Melanin is composed of 50% and 50% eumelanin precursors of synthesis and pheomelanins tricocromi.
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