At $240, MDNA Skin The Serum doesn't exactly come cheap -- though would you expect any less from Madonna? If you've got the spare cash, you should consider shelling it out, as it combines the moisturizing power of three forms of hyaluronic acid, along with apple stem cell, resveratrol and vitamins to basically give you the best skin of your life. Cue "Like a Virgin!"

When it comes to mastering that coveted glowy complexion, don't count French pharmacy brands out: They've got their skin care game on lock. The La Roche-Posay Hydraphase Intense Serum is something of a moisturizing superstar between its hyaluronic acid content and its soothing antioxidant thermal springwater.

The Strivectin Advanced Acid Rehydrate + Replump Hyaluronic Dual-Response Serum, $79, might just be a new essential addition to your routine. The convenient pump packaging has got a cool design with two separate chambers -- one is packed with six types of hyaluronic acid, while the other has Strivectin's NIA-114 complex as well as ceramides. Apply it day or night for a continually dewy complexion.

All you need is a few drops of SkinCeuticals H.A. Intensifier Serum, $98, and your skin will look instantly plumper and more radiant. It contains licorice root and purple rice, which boost your natural hyaluronic acid production (and give the serum a pretty lavender glow), as well as tons of hyaluronic acid for immediate hydration.

First, Neutrogena Hydro Boost Water Gel became a must-have product for anyone looking for lightweight moisture. And now, Neutrogena Hydro Boost Hydrating Serum, $18, is joining the family. You can layer it under the gel for even more hydration, or you can use it on its own -- it's the perfect barely-there option for summer months.