What It Is:Restore and retain moisture with Kiehl's concentrated 1.5% Hyaluronic Acid serum which visibly revitalizes, replenishes and intensively hydrates skin.What It Does:With 1.5% Hyaluronic Acid, this facial serum is formulated with just seven ingredients to help replenish dry skin and retain moisture for healthy-looking, hydrated skin. Free of fragrance and colorants, this concentrated serum is minimally formulated for skin absorption and hydration.How To Use It:In the morning and evening,