How does the human bodys skin tan?
Simply speaking, this is the body’s self-defense mechanism against over exposure to natural sunlight. In the skin, composed of Epidermis, Dermis and Endodermis, there are special cells called Melanocytes. These cells are unevenly distributed over the body and are activated by the short UV-B rays to produce pigmentation – Melanin. It is these particles of pigmentation which, when they encounter the proper intensity of UV-A light, oxidize and produce the desired brown color for a tan. Therefore, it takes a small amount of UV-B to start the process of tanning and a far greater amount of UV-A to produce the desired tan. This is exactly the output of the Sunvitale Sun System. The long UV-A rays are gentle. They tan without burning.
