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; dermalogica.com), 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; neocutis.com 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; esteelauder.com) softens skin around the eyes to help reduce the appearance of crow's-feet.