(formerly known as REPLENIX Pure Hydration Hyaluronic Acid Serum)REPLENIX Hyaluronic Acid Hydration Serum is an intensely pure, medical-grade, ultra-hydrating serum with fractionated hyaluronic acid that quenches dehydrated, dull skin for a supple, smooth, plump-looking complexion. Visibly reducing the signs of aging, skin appears brighter, firmer, and rejuvenated as skin’s barrier is protected from damaging free radicals. Reduce the signs of aging and protect skin's barrier from free radical damage with REPLENIX Hyaluronic Acid Hydration Serum.