Global Perspectives on Regional Sun Protection Factor (SPF) Requirements: Scientific and Regulatory Insights.

1. Cureus. 2026 Feb 17;18(2):e103757. doi: 10.7759/cureus.103757. eCollection 2026 Feb. Global Perspectives on Regional Sun Protection Factor (SPF) Requirements: Scientific and Regulatory Insights. Patel MN(1)(2), Patel N(1). Author information: (1)Clinical Research Operations, NovoBliss Research Private Limited, Ahmedabad, IND. (2)Pharmacology, Swaminarayan University, Ahmedabad, IND. Ultraviolet (UV) radiation is a well-established environmental factor contributing to acute and chronic skin damage, including erythema, photoaging, pigmentary disorders, and skin cancer. Sunscreens represent a cornerstone of photoprotection strategies, with sun protection factor (SPF) serving as the primary measure of protection against UVB-induced erythema. However, UV exposure varies considerably across geographic regions due to differences in latitude, climate, altitude, and lifestyle, necessitating region-specific SPF recommendations. In parallel, sunscreen regulation and SPF claim substantiation differ across global jurisdictions, influencing product development, labeling, and consumer communication. This scientific communication reviews the biological basis of UV-induced skin damage, the rationale for region-wise SPF selection, and the regulatory frameworks governing sunscreen efficacy and claims across major global authorities, including India (Bureau of Indian Standards (BIS)), the European Union (EU; European Cosmetic, Toiletry and Perfumery Association (COLIPA)), the United States (Food and Drug Administration (FDA)), Australia (Therapeutic Goods Administration (TGA)), Canada (Health Canada), and Japan (Ministry of Health, Labour and Welfare (MHLW)/Japan Cosmetic Industry Association (JCIA)). While regulatory approaches differ in classification, UVA assessment methodologies, and labeling systems, there is a shared scientific consensus on the importance of validated SPF testing, broad-spectrum protection, and responsible communication. Harmonization through international testing standards has improved comparability of sunscreen efficacy, although regulatory diversity continues to pose challenges for global implementation. Integrating scientific evidence with existing region-specific regulatory requirements is essential for effective photoprotection, informed sunscreen use, and improved public health outcomes. Copyright © 2026, Patel et al. DOI: 10.7759/cureus.103757 PMCID: PMC13000865 PMID: 41869094 Conflict of interest statement: Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work.