Summer Skin Care - How SPF is Determined

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07/26/2009

Summer skin care can become confussing when purchasing a sunscreen becomes a flash back to math class with all of the numbers involved. Those numbers are used to show the effectiveness of a sunscreen. That effectiveness can be dependant upon other factors such as skin type and proper usage. Often people do not consider the method laboratories use to the measure the SPF of a sunscreen. 

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