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Objective  Recent research has shown that significant levels of cyclobutane pyrimidine dimers (CPDs) in DNA continue to form in melanocytes for several hours in the dark after exposure to ultraviolet radiation (UVR) ends. We document the utility of a new multifunctional ingredient, 3‐(4‐hydroxy, 3‐methoxybenzyl)‐pentane‐2,4‐dione (INCI acetyl zingerone (AZ)), to protect melanocytes against CPD formation after UVR exposure ends.    Methods  The use of AZ as an intervention to reduce CPD formation after irradiation was assessed  in vitro  by comparing kinetic profiles of CPD formation for several hours after irradiation in cells that were untreated or treated with AZ immediately after irradiation. Multifunctional performance of AZ as an antioxidant, quencher and scavenger was established using industry‐standard  in vitro  chemical assays, and then, its efficacy in a more biological assay was confirmed by its  in vitro  ability to reduce intracellular levels of reactive oxygen species (ROS) in keratinocytes exposed to UVA radiation. Molecular photostability was assessed in solution during exposure to solar‐simulated UVR and compared with the conventional antioxidant α‐tocopherol.    Results  Even when added immediately after irradiation, AZ significantly inhibited ongoing formation of CPDs in melanocytes after exposure to UVA. Incubation with AZ before irradiation decreased intracellular levels of UVA‐induced ROS formation in keratinocytes. Compared with α‐tocopherol, the molecular structure of AZ endows it with significantly better photostability and efficacy to neutralize free radicals (∙OH, ∙OOH), physically quench singlet oxygen ( 1 O 2 ) and scavenge peroxynitrite (ONOO − ).    Conclusion  These results designate AZ as a new type of multifunctional ingredient with strong potential to extend photoprotection of traditional sunscreens and daily skincare products over the first few hours after sun exposure ends.

Acetyl zingerone: An efficacious multifunctional ingredient for continued protection against ongoing DNA damage in melanocytes after sun exposure ends