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.

Even though Kate Somerville Wrinkle Warrior, $95, minimizes fine lines in as little as a week, it also has results you can see immediately. Thanks to a special pepper extract, wrinkles seem to disappear on contact. And, of course, it has hyaluronic acid -- three sizes for best absorption.