L'Oréal Hair Expertise Glycolic Gloss Leave-In Serum is a lightweight, glossing treatment that instantly revitalizes dull and tired-looking hair without weighing it down. Formulated with glycolic acid, this serum gently exfoliates the hair's surface to remove buildup from styling products and hard water minerals, restoring natural shine and smoothness. This water-based, non-greasy formula is suitable for all hair types, including straight, wavy, curly, and coily textures. For best results, apply a small amount to clean, damp hair from mid-lengths to ends, then style as usual. You should use this leave-in serum to achieve a brilliant, salon-fresh gloss between color services and to maintain a healthy-looking, frizz-free finish that lasts all day.