Is there a term from the field of dermatology and cosmetics that you do not understand? Would you like to know what it means? View the full definition from the La Roche-Posay glossary.
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Your face skin
Your skin in the sun
A chemical filter is a synthetic molecule that protects against ultraviolet rays by absorbing their energy. To achieve quality filtration of all UV rays, you must combine filters that are effective against UVB's and other filters which target UVA's.