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“Photooxidation of alpha-tocopherol (alpha-TH) and photoperoxidation of lipids in blood cell membranes in the presence of hematoporphyrin (HP) as a photosensitizer were inhibited by quercetin.”
“The presence of endogenous photosensitizers in the skin could potentially affect the UV stability of quercetin , suggesting that further study of quercetin for both its photoprotective properties and photostabilty in skin are warranted.”