A review published in the November 2025 issue of Photodermatology, Photoimmunology & Photomedicine concludes that a short list of non-filtering ingredients, led by L-ascorbic acid, tocopherol, photolyase, and nicotinamide, can add protection beyond ultraviolet filters. The authors, a team led by environmental dermatologist Jean Krutmann of IUF-Leibniz Research Institute, screened a classification of more than 1,700 candidate ingredients.
What did the review actually find?
The paper examined what the authors call PINGs, photoprotective ingredients that work through antioxidant, DNA repair, immunomodulatory, anti-inflammatory, and pigmentation-regulating mechanisms rather than by absorbing or reflecting UV. Per the review's results, antioxidants like L-ascorbic acid and tocopherol "enhanced protection against UVR and IR-A-induced oxidative stress," while nicotinamide "improved DNA repair and prevented UV-induced immunosuppression," and the DNA repair enzyme photolyase reduced cyclobutane pyrimidine dimer formation, a marker of UV-inflicted DNA injury that accumulates with repeated exposure. The pigmentation modulators p-coumaric acid and isobutylamido thiazolyl resorcinol showed benefits in darker phototypes, which matters for readers who are often told sunscreen innovation skips them. The full text is available via the National Library of Medicine's open-access archive.
Why does this matter for sunscreen shoppers?
Because the funnel is brutally narrow. The authors report that "fewer than 2% of candidate PINGs are clinically validated, and only 18 are approved for use in sunscreens," which turns most "antioxidant-infused" label claims into marketing until a formula names which validated ingredient it uses and at what strength. The review also states that protection against visible and infrared radiation "remains largely underexplored." Transparency note: two coauthors are employees of the sunscreen maker ISDIN, and most authors disclose industry consulting ties, all listed on the PubMed record for the study.
What does the evidence not show?
It does not show that booster ingredients replace filters, and it does not establish that any specific commercial sunscreen outperforms another because of them. The authors' own conclusion calls for "standardized testing and additional clinical trials" before PINGs become core components of next-generation sunscreens. Until then, the evidence-backed baseline is unchanged: a broad-spectrum sunscreen applied generously and reapplied regularly, with antioxidant-heavy formulas treated as a possible bonus layer, not a substitute. The review's own framing is that biological photoprotection could address the key limitations of traditional sunscreens, including dependence on high UV filter concentrations, which is where improved comfort and compliance, wearing it daily because it feels better, could do real work.
This article is for informational purposes only and does not constitute medical advice. Cosmetics are not treatments for medical conditions. For persistent skin, hair, or scalp concerns, consult a dermatologist or qualified healthcare professional.
