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Ultraviolet radiation induces oxidative photoaging in the skin cells. In this study, we investigated the ability of andrographolide (ADP) to protect human dermal fibroblasts (HDFa) from UVB radiation‐induced oxidative stress and apoptosis. The HDFa cells were exposed to UVB (19.8 mJ/cm2) radiation in the presence or absence of ADP (7 μM) and then oxidative stress and apoptotic protein expression were...