PINGing Sunshine: A Review of the Evidence for Adding Non-Filtering Photoprotective Ingredients to Sunscreens

Document Type

Article

Publication Date

11-1-2025

Publication Title

Photodermatology, photoimmunology & photomedicine

Keywords

Sunscreening Agents, Humans, Ultraviolet Rays, Antioxidants, Skin Aging, DNA Repair

Abstract

BACKGROUND: Photoprotective INGredients (PINGs) are non-filtering agents that enhance the skin's intrinsic defenses against solar radiation. Acting through antioxidant, DNA repair, immunomodulatory, anti-inflammatory, and pigmentation-regulating mechanisms, PINGs may prevent or repair photodamage. When incorporated into sunscreens, they offer protection beyond ultraviolet (UV) filters. This strategy of biological photoprotection could address key limitations of traditional sunscreens and reduce dependence on high UV filter concentrations.

METHODS: We conducted a focused literature review based on our prior evidence-based classification of over 1700 topical PINGs. We selected ingredients with the strongest clinical and mechanistic support and assessed their biological activity, formulation compatibility, and relevance to key endpoints such as erythema, pigmentation, photoaging, and immunosuppression.

RESULTS: Top-ranked PINGs, including L-ascorbic acid, tocopherol, photolyase, and nicotinamide, demonstrated efficacy across multiple photodamage endpoints. Antioxidants like L-ascorbic acid and tocopherol enhanced protection against UVR and IR-A-induced oxidative stress. DNA repair enzymes, such as photolyase, reduced cyclobutane pyrimidine dimer formation and supported immune function. Nicotinamide improved DNA repair and prevented UV-induced immunosuppression. Pigmentation modulators such as p-coumaric acid and isobutylamido thiazolyl resorcinol showed benefits in darker phototypes.

CONCLUSIONS: Fewer than 2% of candidate PINGs are clinically validated, and only 18 are approved for use in sunscreens. Protection against visible and infrared radiation remains largely underexplored. Standardized testing and additional clinical trials are needed to advance PINGs as effective components of next-generation sunscreens.

Medical Subject Headings

Sunscreening Agents; Humans; Ultraviolet Rays; Antioxidants; Skin Aging; DNA Repair

PubMed ID

41152208

Volume

41

Issue

6

First Page

70062

Last Page

70062

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