Serums are known for being runny and thin, but Peter Thomas Roth Water Drench Hyaluronic Cloud Serum, $65, is anything but. Even though it has a whopping 75 percent hyaluronic acid, it also contains silk proteins that give it a truly cloud-like feel.

SkinMedica HA5 Rejuvenating Hydrator, $178, is so much more than a moisturizing serum. It also has antioxidants -- in the form of flower stem cells -- and peptides to fight aging, and it boosts your skin's own hyaluronic acid production.

A special type of hydrolyzed hyaluronic acid helps PCA Skin Hyaluronic Acid Boosting Serum, $115 (available in April on pcaskin.com), get deep down into the skin to repair wrinkles over time. Meanwhile, ceramides lock in moisture, and niacinamide brightens and protects.

If you're looking to add hyaluronic acid to your favorite skin care products, Skin Inc. Hyaluronic Acid Long Lasting Hydration Serum, $45, is for you. All you need is a few drops, and moisture levels are boosted.

L'Oreal Paris Hydra Geuius Daily Liquid Skin Care, $17.99, feels like a big glass of ice cold water on a hot day -- it's instantly soothing and moisturizing. Plus, the hydration lasts a full 72 hours, which is simply magical.