Efficacy of Cosmetic Products in Preventing Pigmentation Induced by High Energy Visible Light (HEVL) [400-450nm]

Plain-language summary

The goal of this double-blind, randomized clinical trial is to evaluate the efficacy of anti-pigmentation cosmetic products in preventing skin pigmentation induced by High Energy Visible Light (HEVL) \[400-450nm\] in healthy volunteers (male and female, aged 18-60 years, Caucasian, phototypes III-IV). The main questions it aims to answer are: Can anti-pigmentation agents and/or HEV filters reduce HEV light-induced skin pigmentation, as measured by the Individual Typological Angle (Delta ITA°)? Can these products improve additional colorimetric parameters (Delta L\*, a\*, b\*, Delta E) and clinical pigmentation and erythema scores (0-13 scale)? Are these formulations safe and well-tolerated under HEVL exposure? Researchers will compare seven cosmetic formulations (Products A to G) to an untreated exposed control zone to assess their ability to prevent HEVL-induced pigmentation. Participants will: Attend 36 visits over 7 weeks Receive standardized product applications (2 mg/cm²) on 7 test zones (3x3 cm) delineated on their back. One test zone will be not treated. Be exposed to HEVL light \[400-450nm\] at 35 J/cm² over 4 consecutive days (Days 8-11) Undergo colorimetric measurements and clinical assessments of pigmentation and erythema at 13 time points

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