If you’re struggling with dark spots, hyperpigmentation, melasma, or post-acne marks, you’ve likely tried everything—vitamin C, retinol, exfoliating acids, niacinamide. While these ingredients can help, most take time and don’t always deliver dramatic results. Enter Thiamidol , a newer, highly effective brightening ingredient that’s quickly becoming a dermatologist favorite. What Is Thiamidol? Thiamidol (also known as isobutylamido-thiazolyl-resorcinol ) is a patented skin-br