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How to Relieve Rosacea - Remarkable Tips to Get Clear Beautiful Skin Fast (134 visualizações)
How to Relieve Rosacea - Remarkable Tips to Get Clear Beautiful Skin Fast Postado em 02/03/2019 01:39 por daisypricilla27
The letters that you Bella Radiance Review see after "UV" are A, B, and C. These refer to the wavelength of the UV light. UV light is the radiation from the sun that causes damage to your skin. UVC ranges from 100nm to 280nm, and most of UVC is blocked by our ozone layer. UVB ranges from 280nm to 320nm. UVB has been shown to be carcinogenic (causes skin cancer), and UVB causes sunburn. UVA ranges from 320nm to 400nm. UVA has definitely been implicated in photoaging of the skin (wrinkles, sunspots). Now there are several studies suggesting that UVA also has a role in causing skin cancer. UVA is what tanning salons use, as UVA causes tanning of the skin.

This is the big question right now. There are several experimental tests that can measure sunscreens' ability to block UVA. PPD (Persistent Pigment Darkening) is a commonly used measure overseas to quantify a UVA blocking. Currently, the FDA in the United States is evaluating a 5 star rating system for UVA protection. The details of this are still being worked out, but expect to see some UVA rating system in the near future on your sunscreen.

It is not uncommon for individuals to be allergic to a component of the chemical blocking sunscreens. It is much more rare to be sensitive to a physical blocking sunscreen. Physical blocking sunscreens have been around for a long time (zinc oxide, titanium dioxide). Think of these acting like a physical barrier (like clothing) between you and the sun.

They are usually not absorbed in the skin, and as a result, may be greasier. Physical blocking sunscreens do a very good job at blocking both UVA and UVB radiation, but their popularity has never taken off because of the white residues and greasiness that they have (although this has improved recently with newer sunscreens using nanotechnology).


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How to Relieve Rosacea - Remarkable Tips to Get Clear Beautiful Skin Fast (134 previews)
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