Ultra Pure High-Potency 9.8% Glycolic Acid Serum, 1 Oz.

After 1 Week, 98% Agree Skin Feels Softer* Instantly, 83% Felt Refined Texture* Smoother Skin in 1 Week** *Reported by consumers in a 4week study. **Expert grading in a 4week clinical study. How to Use: In the evening, apply 2-3 drops to clean, dry skin. 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 amp; rebalance skin's moisture. Layer with Kiehl's Niacinamide Serum to reduce oil amp; soothe skin.