When it comes to hydration, hyaluronic acid is a miracle molecule -- largely because it can hold 1000 times its weight in water. And hyaluronic acid isn't a weird chemical created in a lab. In fact, it naturally exists in skin, and synthetic hyaluronic acid is virtually identical to what your body already makes.

Beauty companies have been incorporating hyaluronic acid into skin care products for years, but lately the trend has been picking up steam. And there's a new generation of serums with hyaluronic as the star ingredient -- not just playing a supporting role.

The rise of fillers like Restylane and Juvederm, which are made of hyaluronic acid, is clearly contributing to the prevalence of these new serums. After all, if you don't want to have your face injected, you can still get some of the benefits of hyaluronic acid by applying it topically. It plumps skin, making it look younger and smoother, it provides long lasting moisture, and it's great for all skin types.

Here, we're featuring some of our favorite new hyaluronic acid serums and explaining what makes each one special.

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Rodan + Fields Active Hydration Serum, $90, packs in moisture like you wouldn't believe. It's something of a miracle product -- the lightweight serum soaks into your skin near-immediately, smoothing fine lines and imparting a dewy glow while its at it.

Have you heard the Korean term "chok chok" before? It translates to bouncy, glowy skin -- aka a cornerstone of every great K-beauty routine. At any rate, if you're looking to increase your chok chok factor, look no further than Hanskin Hyaluron Skin Essence: Pat it on after washing your face, and you're well on your way to that covetable bouncy and glowy complexion.

How's this for a match made in heaven: hyaluronic acid and coconut oil. Two of your favorite moisturizing superstars join forces in the Ulta Dewdrench Replenishing Essence, $19.50 -- and honestly, what's not to love? Plus, at just shy of $20, it's fairly affordable, and you'll love how soft it makes your skin.

If there was a class superlative for prettiest formula, it would most certainly go to the H2O+ Oasis Hydrating Booster. And it's got more than just looks going for it: This lightweight hyaluronic acid serum adds a considerable amount of non-greasy hydration, and the pretty blue beads suspended in the formula are packed with glow-boosting vitamins A and E.