Mechanistic Insights into UV-Induced Molecular Responses from Commercial Nail Dryer Exposure

This study aimed to measure the UV light emitted by nail dryers available on the market and to assess the potential risks of both immediate and accumulated skin damage. It also sought to explain exposure levels based on known molecular processes related to UV-induced cell stress.

UVA and UVB emissions from various UV and UV/LED nail dryer devices were systematically evaluated using a calibrated UV meter. Measurements were taken from defined internal cavity locations and external leakage points while maintaining consistent distances between the detector and source under typical operating conditions. Devices were grouped by lamp type, model, and usage duration. Statistical analyses were applied to compare UV emission levels and leakage patterns across different devices. Relative risk (RR) values were estimated based on accepted exposure limits to indicate the potential for skin damage.

21 devices were analyzed, including UV and UV/LED models. There was no significant difference in internal UV emission between the two types (P = 0.096). However, UV leakage was significantly higher in UV/LED devices (P < 0.001). The UV irradiance varied noticeably based on location, with the highest intensities recorded in the back and bottom areas of the internal chamber. The RR assessment showed that values exceeded recommended safety limits at several measurement points, particularly with repeated or prolonged exposure.

The results suggest that nail dryer devices can emit and leak UV radiation at levels that may exceed established safety limits, increasing the risk of cumulative skin damage. These findings highlight the need for standardized safety guidelines and effective strategies to reduce user exposure.

Commercial nail dryers may emit UV radiation at levels above recommended safety thresholds, raising concerns about both short-term and long-term effects on the skin. While direct biological outcomes in humans were not assessed, the potential implications were interpreted based on established UV-responsive molecular pathways. By combining exposure data with current knowledge of UV-induced oxidative stress and DNA damage, this study emphasizes the need for stronger safety regulations and continued risk assessment for cosmetic devices.