Photo: Marko Metzinger/Studio D

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Hyaluronic Acid
Sodium hyaluronate or hyaluronan

Draws water to the skin to moisturize and temporarily plump.

From left to right:

If your skin is very dry, layer a rich cream, like Dermalogica Skin Smoothing Cream ($39;, over a hydrating serum (like the one above). A double dose of hyaluronic acid repairs skin quickly.

To get rid of flakes and rough patches, apply Neocutis Hyalis 1% Hyaluronate Refining Serum ($95; for physician providers) in the morning and at night—especially if you're using a retinoid product, which can be drying.

Estée Lauder Advanced Night Repair Eye Serum Infusion ($62; softens skin around the eyes to help reduce the appearance of crow's-feet.