Today doctors are becoming increasingly emphasize the need to use sunscreen for the skin. But, do you know how to choose an effective one? We see all the details. A recent study by the Feinberg School of Medicine at Northwestern University in Chicago found that for many Americans the information on the labels of sunscreens is a mystery. Only 49% of survey participants knew what the letters " SPF "(stands for sun protection factor) displayed on sunscreen bottles represent. Most I believed that sunscreens with a high sun protection factor are more effective against sunburn and skin cancer than those with a low rate. The problem is that there are two types of ultraviolet (UV) with different effects on the skin: UVA: totally reaches the earth's surface; tan immediately, but the result is short-lived. They have the ability to penetrate through the glass and into the deeper layers of the dermis, which generate free radicals that cause cell changes and cause premature
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