The serum is made with multiple ingredients that prevent water loss and lock in moisture on your skin, including two types of hyaluronic acid, vitamin B5, and glycerin. It also features madecassoside, an antioxidant that boosts hydration and is gentle enough to use on sensitive and acne-prone skin. For the best results, the brand recommends putting three to four drops on your face and neck every morning and night after cleansing. The serum can also be applied underneath a moisturizer.

This Eye Cream Combats Dryness, Fine Lines, and Puffy Under Eyes — and It’s My All-time Favorite

“My skin leans on the dry side,” one customer said. “I used to smother my face in oil every day to keep my face feeling moisturized. It would work for a little bit, but I’d usually end up feeling dry again by the end of the day. This stuff seriously works like nothing else. I put it on after showering and patting excess moisture off my face and my face stays hydrated. I’ve even gone two days in a row with only one application feeling hydrated.”

Shoppers gave the serum high marks for its anti-aging properties, too, sharing that it plumped their skin and diminished the appearance of fine lines “like nothing ever has before.” Some users even saw results “within days” after they began using it.

To buy: amazon.com, $30

“I’m so pleasantly surprised by the obvious results. It really did exactly what it claimed it would,” a 70-year-old reviewer wrote. “My complexion looks tighter, very moisturized, soft, and smooth. I’ve pretty much stopped using foundation, and find that a bit of blush and lipstick is all it takes to look just fine. Love the product! Highly recommend.“Pick up La Roche-Posay’s hydrating serum today — according to shoppers, it’s the only thing your skin needs to stay moisturized this winter.Love a great deal? Sign up for our T+L Recommends newsletter and we’ll send you our favorite travel products each week.