HYALR MOIST PLMP SRM 30ML 1.0OZ. Benefits: Add a drop of Kiehl's Hyaluronic Acid Serum to your liquid makeup (foundation or highlighter) to add a boost of hydration/sheer out the coverage to a tint. Key Ingredients: Hyaluronic Acid: helps skin better retain moisture to improve the look of resiliency and make skin feel more supple and bouncy by delivering skin-strengthening hydration. Research Results: After 1 Week, 83% Agree Skin Looks Replenished*. Instantly Boosts Hydration by +89%** Plumper Skin in 1 Week***. *Reported by consumers in a 4-week study.. **Based on an instrumental study.. ***Expert grading in a 4-week clinical study..