Not to be confused with exfoliating acids such as AHAs and BHAs, Hyaluronic Acid is a sugar molecule that is naturally present in the human body. Its main role as a humectant is to bind water to collagen (it can hold up to 1,000 times its weight in water), trapping it within the skin to keep it plump and glowing. Natural levels of Hyaluronic Acid decline as we age, but topical application via skincare products can help to boost hydration, texture and glow.