Hydrate vs Moisturize: What Benefits Aging Skin More?

If you have yet to encounter the hydrate versus moisturize debate, you’re not alone. Even the most savvy skin-care consumers often consider the two interchangeable, but a hyaluronic acid serum and barrier-minded face moisturizer can deliver their own respective (and often complementary) benefits: In short, hydration offers water, while moisturizer imparts oil.

And that simple distinction means that they have two unique roles within skin, with implications for all skin types—and aging skin in particular. With that in mind, here’s why it’s worth discerning the key differences between hydration and moisturizing, and why you might benefit most from using both in your routine.

Think of hydration as filling the reservoir and moisturizing as building the dam, suggests Jessie Cheung, M.D., a board-certified dermatologist in Chicago, IL and New York, NY. “Hydrating is about increasing the water content within the skin and helping it attract and hold onto that water, largely through humectants and the skin’s own natural moisturizing factors,” she explains. “Moisturizing is about strengthening that outer barrier with lipids and helping prevent water from evaporating.”

Both components—water and lipids—are important for skin, but they become increasingly critical as you get older. Over time, “skin produces less of its own hyaluronic acid and natural moisturizing factors, so it doesn’t hold onto water as efficiently,” says Dr. Cheung. At the same time, she adds, our skin barrier weakens and produces fewer lipids like ceramides, which means water can escape more easily. “So aging skin isn’t just ’drier’,” she says. “It’s dealing with a double hit: less water retention capacity and a leakier barrier.”

This can lead skin to look and feel rough, dry, and crepey. But this isn’t the only change occurring in your skin as you age. “Collagen and elastin production also decline, and the skin’s ability to repair itself slows down,” says Jenna Queller, M.D., a board-certified dermatologist in Boca Raton, FL. “These changes can lead to increased dryness, rough texture, fine lines, and a loss of that youthful ‘bounce’ many people associate with well-hydrated skin.”

To complicate matters, hormonal shifts, like the swings and eventual drop in estrogen during perimenopause, can make the situation worse, since estrogen receptors play a role in the production of hyaluronic acid, barrier lipids, and even collagen. As a result, going with only hydration or moisture is a strategy that tends to “underperform” on mature skin, as Dr. Cheung puts it. “You need to replenish the reservoir and reinforce the dam,” she says.

In general, hydration comes first. “I often recommend applying a hydrating serum first, while the skin is slightly damp, and then follow with a moisturizer to lock in that hydration and support the barrier,” says Dr. Queller. Those product categories are no accident, either. A face serum, which typically delivers a high concentration of active ingredients, is designed to more easily penetrate skin; thicker textures like a cream, meanwhile, can help create a physical barrier over that.

So in the context of hydration and moisture, “a serum can deliver ingredients that attract water into the skin, while a cream or lotion helps prevent that water from escaping,” says Dr. Queller.

When it comes to hydration, it’s hard to beat humectants. You may already be familiar with hyaluronic acid and glycerin, as well as polyglutamic acid. “These attract and bind water to the skin,” says Dr. Queller. That can deliver a plumping, smoothing effect, making hydration especially helpful for those with dull, dehydrated skin, which lacks water (as does oily skin).

However, not all humectants are created equal—which is why the formulation matters, says Dr. Cheung. Take hyaluronic acid, for example. “Low molecular weight HA penetrates more deeply, while higher molecular weight sits on the surface for immediate plumping,” she says, adding that she likes products that layer both. Polyglutamic acid, meanwhile, works by binding water at the skin’s surface “while forming a lightweight film to retain water,” she says.

Chanel Hydra Beauty Micro Sérum pairs hyaluronic acid with white camellia extract to plump skin and leave it radiant, while Laneige Water Bank Blue Hyaluronic Serum harnesses a fermented form of hyaluronic acid that’s small enough to penetrate to deeper layers of skin, hydrating it with the inside out.

For moisture, both dermatologists point to ingredients that are naturally found in the skin barrier: namely, ceramides, cholesterol, and fatty acids. “Think of these lipids as the ’mortar’ between the bricks of your skin barrier that decline with age,” says Dr. Cheung. All skin types can benefit from these, but they’re particularly helpful for those with dry skin (which lacks lipids) as well as skin that’s inflamed or compromised in some way. SkinCeuticals Triple Lipid Restore 2:4:2 contains this exact trio of ingredients—and, better yet, in the proportions that they’re naturally found within the skin barrier.

Squalane is also a good option, as it’s nearly identical to your natural sebum and sinks in without feeling occlusive, according to Dr. Cheung. Aestura’s Atobarrier365 Cream pairs it with those critical ceramides and cholesterol to nourish, bolster, and protect the skin barrier And finally, “cetearyl alcohol is a fatty alcohol that supplements the lipid environment and fills the spaces between skin cells,” she says.

These days, it’s not hard to find a formula that contains both hydrators and moisturizers in equal measure—a boon for mature skin. Some ingredients actually do both: “Panthenol, urea, and beta-glucan all hydrate while supporting barrier repair, so they do double duty,” says Dr. Cheung.

Both dermatologists recommend La Roche-Posay Toleriane Double Repair Face Moisturizer in particular, as it pairs glycerin—a time-tested humectant—with ceramides. It’s “deeply moisturizing, and leaves skin feeling soft, calm, and hydrated without feeling greasy,” says Dr. Queller. That makes it especially beneficial for daytime, when you might slather it on beneath makeup.

For the evening, meanwhile, Dr. Cheung points to the CeraVe Skin Renewing Night Cream. It “combines ceramides with hyaluronic acid, so you’re getting hydration plus barrier support in one product,” she says. Consider the combination of hydration and moisture the best of both worlds—and an invaluable way to keep skin healthy, radiant, and youthful in the long run.

When we test and review a product, we take a holistic approach to deliver well-rounded product recommendations. First, we lean on Vogue's vast network of experts—from board-certified dermatologists to celebrity estheticians—to gain professional acumen on the industry's standout products, ones these specialists would actually use on their clients. We pair their expertise with our editorial best practices to curate the thoughtful edits you read on our site.

As it relates to hydrating and moisturizing skincare, we selected the best based on the following characteristics: ingredients, texture, packaging, finish, and the skin-care concerns they address. To do this, we paired our own personal tests of each formula with expert guidance and reviewer insights to determine which we would recommend to you. Read more about our testing methodology here.