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Updated: Jul 5, 2026

Quantification of Hypopigmentation Activity In Vitro

Quantification of Hypopigmentation Activity In Vitro

Published on: March 6, 2019

A simple experimental method to study depigmenting agents.

M L Abella¹, J de Rigal, S Neveux

¹L'Oréal Recherche, Chevilly-Larue, France. mlabella@rd.loreal.com

International Journal of Cosmetic Science

|May 21, 2008

Summary

This summary is machine-generated.

This study introduces a simple method to compare skin depigmenting products using controlled UV exposure. C8-LHA demonstrated excellent efficacy and tolerance for treating hyperpigmentation.

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Area of Science:

Dermatology
Cosmetic Science
Photobiology

Background:

Hyperpigmentary disorders are common skin concerns.
Evaluating depigmenting agents requires reliable and efficient methods.
Controlled UV exposure can induce a standardized hyperpigmentation model.

Purpose of the Study:

To validate a controlled UV exposure model for comparing depigmenting product efficacy.
To assess and compare the depigmenting effects of ellagic acid, vitamin C, and C8-LHA.
To establish a simple experimental method for rapid product comparison.

Main Methods:

Sixteen volunteers underwent controlled UV exposure on forearm areas.
Test products (ellagic acid, vitamin C, C8-LHA) were applied to randomized zones.
Colorimetric measurements (Chromameter, Spectro-colorimeter) and visual assessment were used.
Application began 72 hours post-exposure and continued for 42 days.

Main Results:

Controlled UV exposure created comparable tanned zones across participants.
Color measurements confirmed the reliability of the model for treatment comparison.
C8-LHA showed significant efficacy in reducing hyperpigmentation.
All tested products demonstrated good tolerance.

Conclusions:

A novel, simple experimental model using controlled UV exposure effectively compares depigmenting product efficacy.
C8-LHA is a highly effective and well-tolerated option for managing hyperpigmentary disorders.
This method allows for rapid screening and comparison of cosmetic and dermatological treatments for pigmentation.