The effectiveness of 1% cysteamine, 3% tranexamic acid, 2% galactomyces ferment filtrate and 4% niacinamide application using double layering technique as a brightening agent: Chromameter and Janus-III analysis. J Pak Assoc Dermatol [Internet]. 2024 May 6 [cited 2026 Jul. 27];34(1):92-7. Available from: https://www.jpad.com.pk/index.php/jpad/article/view/2405