Skinlab Hyal-A Hyaluronic Acid Duo Vitamin B5 Serum is Hyaluronic Acid Serum and Anti-Aging Concentrate is a serum formulated with two types of Hyaluronic Acid and Vitamin B5. Hyaluronic Acid absorbs up to 1,000 times its weight in water for an immediate plumping effect and long lasting hydration. High molecular weight Hyaluronic Acid creates an invisible surface barrier on skin to lock in moisture, while low molecular weight Hyaluronic Acid helps leave skin feeling plump to the touch. Vitamin B5 helps hydrate and support the skin barrier. This Hyaluronic Acid serum has a fresh fragrance and also contains, Madecassoside to help soothe skin.