Sunscreens can actually make the skin more vulnerable to UV radiation if they are not applied liberally and often, research by a scientific team in California has revealed.
Chemists at the University of California Riverside say that this problem can be further compounded if the sunscreen does not contain an adequate UVA filter, on top of a UVB filter.
The team, led by Kerry Hanson, worked around the principal that exposure to UV light can lead skin molecules to generate harmful compounds called reactive molecule species, or ROS - highly reactive molecules that can cause oxidative stress in skin cells. ROS can react with the various cellular components of the skin, which in turn increases the risk of visible aging such as wrinkles.
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