Neutrogena Hydro Boost Hyaluronic Acid Serum instantly quenches for visibly smooth and supple skin. No added fragrance. 17% hydrating complex for smooth supple skin. Neutrogena Hydro Boost Hyaluronic Acid Serum Our unique formula with bursting hyaluronic pearls delivering our most concentrated hydrating serum yet. Infused with glycerin that delivers moisture 9 cell layers deep into the outer layer of the skin, to reveal smooth and supple skin. This light-weight hyaluronic acid serum contains 17% hydration complex that quickly absorbs into your skin. Infused with micro + macro hyaluronic acid to hydrate deeper into the skin surface, while pro-vitamin B5 and prebiotic technology help boost skin renewal and recovery, for healthy looking skin.