How to use Hyaluronic Acid: damp skin, morning or night, and what to layer it with

Key takeaways

• Damp skin: Apply a Hyaluronic Acid serum to skin that’s still a little damp from cleansing, then follow with a moisturizer.

• Seal it in: A humectant used on its own can let more water escape from skin, so a moisturizer or occlusive on top is the step that keeps it working.

• Morning, night, or both: Hyaluronic Acid fits either routine, and twice a day works for most routines.

• Layering: It can share a routine with Retinol and Vitamin C, applied lightest to heaviest, with sunscreen last in the morning.

• On the label: Look for Sodium Hyaluronate as well as Hyaluronic Acid, since most formulas use the salt form.

Using Hyaluronic Acid well comes down to water and timing

Hyaluronic Acid is easy to add to a routine and easy to undersell. Most of what decides how your skin looks after using it happens in the minute after you apply it: how damp your skin is and what you layer on top.

This letter covers the mechanics. If you’re still deciding whether your skin is dry, dehydrated, or both, start with dry vs dehydrated skin, and if you’re choosing a formula, our roundup of Hyaluronic Acid serums compares them.

What Hyaluronic Acid does once it’s on skin

Hyaluronic Acid is a humectant, meaning it attracts and holds water. A 2021 review in Molecules puts it this way: “Hyaluronic acid (hyaluronan) has a unique capacity to link and retain water molecules.” That’s why it can help skin look plumper, and it’s also why it needs water close by to hold.

The same review describes how heavier forms behave on skin: “HMW-HA forms a viscoelastic film when applied onto the skin and has a moisturizing effect.” Many serums blend several molecular weights so that some of the formula stays at the surface as that film.

It may not be listed as Hyaluronic Acid at all. In that 2021 review, products that contain Hyaluronic Acid itself “represent only 5%, while more than 95% of the total products contain sodium hyaluronate.” Sodium Hyaluronate is the salt form, and on an ingredient list it does the same job. The Ordinary’s Hyaluronic Acid 2% + B5, for example, lists Sodium Hyaluronate second, right after water, followed further down by Hydrolyzed Hyaluronic Acid and Sodium Hyaluronate Crosspolymer.

How to apply a Hyaluronic Acid serum, step by step

The order below works for a standalone serum. If the product has its own directions, follow those first.

• Cleanse, then leave skin damp: Pat your face until it’s damp but not dripping. The American Academy of Dermatology advises, of moisturizer in general, “Be sure to apply your moisturizer when your skin is still damp after taking a shower or bath,” and the same logic carries over to a humectant serum: It has water close at hand to hold.

• Use a small amount: A few drops, or the amount the label suggests, is usually enough for the face and neck. Extra product is unlikely to add hydration and can feel tacky under the next step.

• Press it in: Spread it across the face and neck with your fingertips and give it about a minute to settle.

• Follow with a moisturizer: This is the step people skip. A 2022 review in Medicina notes that “Because transepidermal moisture loss can increase when a humectant is applied alone, humectants are usually used together with an occlusive agent.” The AAD makes the same point about moisturizer on damp skin: “the moisturizer is more effective because it traps water in the skin and keeps it from evaporating.”

• Finish with sunscreen in the morning: The AAD advises: “Always put sunscreen on after other skin care products.” Wear a broad-spectrum sunscreen every day, under any makeup.

Morning or night, and how often to use it

Hyaluronic Acid works in either routine. In the morning it sits under moisturizer and sunscreen; at night it sits under your moisturizer or any treatment cream.

Twice a day is a reasonable default. In one 28-day trial summarized in a 2022 review in Dermatologic Therapy, “the HA serum was applied twice daily,” and the review’s authors report that “Several clinical studies indicate that HA is both well tolerated and effective.” Once a day works too, especially if your skin already feels comfortable by midday.

If your skin looks visibly dry or feels tight by the afternoon, a second layer of moisturizer usually does more than a second layer of serum.

Layering Hyaluronic Acid with Retinol and Vitamin C

The general rule is texture. Cleveland Clinic’s dermatology guidance says a routine “should be ordered from lightest to heaviest (or thinnest to thickest).” Most Hyaluronic Acid serums are water-light, so they’re applied early, after any thinner treatment serum and before moisturizer.

With Vitamin C: A Vitamin C serum is usually a morning step, and Hyaluronic Acid can share that routine. Apply the Vitamin C serum first, then Hyaluronic Acid, then moisturizer and sunscreen. Our guide to layering a Vitamin C serum covers what else pairs with it.

With Retinol: Retinoids are usually an evening step, and they can leave skin looking visibly dry or feeling irritated while you get used to them. Writing about prescription Retinoids, such as Tretinoin, the AAD notes that “These treatments tend to dry and irritate the skin. Using a moisturizer every day can help your skin tolerate these medications.” A Hyaluronic Acid serum under that moisturizer adds a humectant layer to the same routine. Apply the Retinol to clean, dry skin first unless its directions say otherwise, then Hyaluronic Acid, then moisturizer. For other partners, see what to layer with Retinol.

The full morning and evening sequence, from cleanser to sunscreen, is in our skincare routine order letter.

Common mistakes with Hyaluronic Acid

• Skipping the moisturizer: A humectant on its own can let water escape, which is the opposite of the point. Treat the moisturizer as part of the Hyaluronic Acid step.

• Applying it to bone-dry skin in dry air: In a heated apartment or a dry climate, damp skin and a richer moisturizer on top give the serum more to work with.

• Using too much: A thick layer can pill or feel sticky under the next product.

• Expecting a change overnight: Skin can look more hydrated soon after applying, but how it looks over time depends on weeks of consistent use alongside a moisturizer and daily sunscreen.

When a moisturizer already contains Hyaluronic Acid

The SUPER Hydrator from U Beauty combines five types of Hyaluronic Acid at different molecular weights with Peptides and Argan, Avocado, and Grapeseed Oils, all powered by proprietary SIREN Capsule Technology™. U Beauty’s directions call for 2 to 3 pumps after the Resurfacing Compound, morning and evening, with extra applications through the day whenever skin wants more hydration.

Superfood Air-Whip Moisture Cream from Youth To The People is a gel cream that lists Hyaluronic Acid among its key ingredients, alongside Kale, Spinach, and Green Tea Extracts. Youth To The People says to apply it to the face and neck after cleansing, day and night.

A moisturizer like either of these combines the humectant step and the moisturizing step. As with any formula, follow the directions on the bottle, and keep sunscreen as the last morning step.

Frequently asked questions

Should Hyaluronic Acid be applied to wet or dry skin?

Damp skin works best for a standalone serum: Pat your face after cleansing so it’s no longer dripping, apply the serum, and follow with a moisturizer. If a product’s directions say dry skin, follow the directions.

Can I use Hyaluronic Acid every day?

Yes. A 2022 review in Dermatologic Therapy reports that clinical studies have found Hyaluronic Acid well tolerated, and one trial it summarizes used a Hyaluronic Acid serum twice a day.

Does Hyaluronic Acid go before or after moisturizer?

Before. It’s a lighter, water-based step, and the moisturizer on top helps hold the water it attracts.

Can I use Hyaluronic Acid with Retinol?

Yes. Apply the Retinol first in the evening, then Hyaluronic Acid, then moisturizer. The humectant and moisturizer layers can help with the visible dryness Retinoids can bring.

Is Sodium Hyaluronate the same as Hyaluronic Acid?

It’s the salt form of Hyaluronic Acid and the version most formulas use. On an ingredient list, either name tells you the product contains it.