What It Is: A concentrated 9.8% Glycolic Acid serum made with only 7 ingredients that visibly smoothes skin texture, minimize pores, and boost skin's glow. Free of fragrance and colorants, this concentrated serum is minimally formulated for skin absorption and smoothing effect. Features and Benefits: Formulated to help visibly minimize pores and refine skin's texture Minimally formulated for optimal skin absorption and efficacy Boosts skin renewal Improve skin texture Enhances skin radiance Reduces the appearance of pores Suitable for all skin types, including sensitive Free of fragrance and colorants Glycolic Acid is a naturally occurring fruit acid derived from sugar cane known to help smooth skin How to Use: Apply 2-3 drops to clean, dry skin in the evening Try out Kiehl's Glycolic Acid serum skin hacks below: Zone treat your face by applying Glycolic Acid Serum to areas prone to roughness. Follow with your favorite moisturizer where needed. Use as an exfoliating treatment for cracked heels. Layer with Kiehl's Hyaluronic Acid Serum to hydrate & rebalance skin's moisture. Layer with Kiehl's Niacinamide Serum to reduce oil & sooth skin. Ingredients: Aqua/Water, Glycolic Acid, Glycerin, Alcohol Denat., Sodium Hydroxide, Sodium Hyaluronate, Hydroxyethylcellulose