Hyaluronic acid is the final word in skin-plumping hydration, but it demands to be used correctly. See the best ways to use HA, and our top serums to try now.

More hydrating than hyaluronic acid, polyglutamic acid is a less well-known but just as powerful ingredient, credited with improving the elasticity, bounce and health of the skin and skin barrier.

Osea’s seaweed-infused lineup is a game-changer ... including five molecular weights of hyaluronic acid. “Different weight hyaluronic acid helps attract moisture into the skin,” she ...

They say: A dual-phase face serum that features squalane, hyaluronic acid and a Hydralift Complex ... skin-soothing ingredients including golden seaweed extract, Japanese lily of the valley ...