Hyaluronic Acid
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Hyaluronic Acid vs Glycolic Acid
Hyaluronic acid is a moisturizing ingredient that pulls water into the skin and holds it there. It treats nothing, and it suits every skin type. Glycolic acid is an exfoliant that loosens dead cells off the surface, so skin looks smoother and brighter. They share the word acid and almost nothing else, which is why most routines end up using both rather than choosing.
At a glance
| The difference | Hyaluronic Acid | Glycolic Acid |
|---|---|---|
| How long until it works | The same day | Two to four weeks for texture |
| Cost | Inexpensive | Inexpensive at home, more in clinic |
Glycolic Acid
Side by side
The differences that matter
What you do
Hyaluronic Acid
On damp skin, then seal it
A serum or lotion applied to slightly damp skin, with a moisturizer on top. Used alone in dry air it can leave skin feeling tighter.
Glycolic Acid
A few nights a week
A toner, serum or pad left on at night. Some people have a stronger peel in a clinic every few weeks instead.
What you will see
Hyaluronic Acid
Plumper, more comfortable skin
Fine dryness lines soften, tightness eases, and skin looks smoother the same day. The change is in comfort, not in the condition.
Glycolic Acid
Smoother, brighter skin
Softer texture, less dullness, smaller-looking pores, and a gradual fade of surface discolouration.
Conditions treated
Hyaluronic Acid
Dry Skin (Xerosis)
Holds a great deal of water, which makes skin look plumper straight away, but it seals nothing. In dry indoor air or a cold winter it can pull water up out of the deeper skin and let it evaporate, leaving the surface tighter than before. It is only useful here applied to damp skin with a cream over the top.
Glycolic Acid
Sun Spots (Solar Lentigines)
Loosens the pigmented cells at the surface so they shed sooner, which lifts a little color out of a spot over months. It works better as the thing that helps a lightening cream get in than as a treatment on its own. Used too often it leaves skin irritated and more sun-sensitive, which on this page is exactly the wrong direction.
1 / 4→
Keratosis Pilaris
Loosens the dead cells stuck at the surface, which smooths the skin around the bumps. It is the most likely of the acids to sting and to leave the skin pink, so it suits the arms and thighs better than the cheeks. On deeper skin tones, build up slowly, because irritation is what leaves the dark marks.
←2 / 4→
Wrinkles and Fine Lines
Regular low-strength use smooths surface texture and softens fine lines, and it helps the dull, uneven look that goes with them. It reaches the outer layers only, so deeper creases and folds are untouched. Used on the same nights as a retinoid it usually causes more irritation than either is worth, so alternate them.
←3 / 4→
Post-Inflammatory Hyperpigmentation
Loosens the pigmented cells at the surface so they shed sooner, which helps brown marks more than gray ones. A low-strength product two or three nights a week is plenty. Stacking it with a retinoid on the same night is the classic way people end up red and peeling, which adds inflammation and slows everything down.
←4 / 4
What it will not do
Hyaluronic Acid
It will not treat anything
Hyaluronic acid does not clear acne, fade dark marks, reduce redness or build collagen. It holds water.
Glycolic Acid
It will not hydrate
Glycolic acid has no moisturizing effect at all. Used too often it leaves skin tight, flaky and irritated.
Related topic illustrations
Hyaluronic Acid
Glycerin
Strong evidence, and the comparison most people never make. It is a humectant that works the same way, costs far less, and holds up better in dry air. Hyaluronic acid feels more elegant on the skin.
1 / 4→
Ceramides
Strong evidence for barrier repair. They do the job hyaluronic acid cannot, by replacing the fats that hold water in. The two are complementary rather than competing.
←2 / 4→
Urea
Strong evidence. Hydrates, and at higher concentrations softens rough, scaly skin. More useful for very dry skin, and it can sting on broken skin.
←3 / 4→
Panthenol
Moderate evidence. Soothing and hydrating, and widely used alongside hyaluronic acid rather than instead of it.
←4 / 4
Glycolic Acid
Lactic acid
Strong evidence. A larger molecule, so it works more slowly and stings less, and it holds water in the skin while it exfoliates. Glycolic acid acts faster on rough texture.
1 / 4→
Mandelic acid
Limited evidence. The gentlest of the common AHAs and less likely to irritate skin into making dark marks. It is slower, and much less studied.
←2 / 4→
Polyhydroxy acids
Limited evidence. Considerably gentler, hydrating, and they have not been shown to increase sun sensitivity. They also do less, more slowly.
←3 / 4→
Salicylic acid
Strong evidence. Oil-soluble, so it works inside the pore, which makes it a better fit for blackheads and acne. Glycolic acid does more for surface tone and texture.
←4 / 4
How long until it works
Hyaluronic Acid
The same day
Hydration is immediate. It is also short-lived, which is why it goes on daily.
Glycolic Acid
Two to four weeks for texture
Brightness comes early. Discolouration takes a few months of steady use.
How it works, illustrated
Hyaluronic Acid
Glycolic Acid
How long it lasts
Hyaluronic Acid
Hours
Water leaves the skin steadily. A moisturizer over the top slows that down.
Glycolic Acid
As long as you keep using it
Turnover returns to its usual pace within a few weeks of stopping.
The downside
Hyaluronic Acid
Almost none
One of the best-tolerated ingredients in skincare. In very dry air it can pull water out of the skin instead of in, which is why a moisturizer goes over it.
Glycolic Acid
Stinging and sun sensitivity
It can sting on application, and it makes skin more sensitive to sun. Daily sunscreen is not optional with an AHA.
Cost
Hyaluronic Acid
Inexpensive
It is already in a large share of drugstore moisturizers and serums.
Glycolic Acid
Inexpensive at home, more in clinic
Drugstore serums and toners are cheap. A course of in-clinic peels costs considerably more.
The at-home or drugstore version
Hyaluronic Acid
Drugstore is the real thing
The serum on the shelf is the same molecule a clinic uses. The injected version is a different product entirely — a filler placed under the skin to add volume, which no serum can do.
Glycolic Acid
The same acid, turned down
Drugstore glycolic acid works at the surface, slowly and without peeling. A clinic peel is the same molecule, stronger and buffered differently, so it reaches deeper and works faster.
Forms and types
Hyaluronic Acid
Serum
A few drops on damp skin, then moisturizer on top. Absorbs in seconds.
1 / 5→
Cream or moisturizer
Hyaluronic acid plus the oils that hold it in. Does more than a serum alone.
←2 / 5→
Essence or toner
Very watery, patted on. Wets the skin and adds humectant in one step.
←3 / 5→
Gel
Cool and weightless, with no oils at all. Enough hydration without a heavy finish.
←4 / 5→
Sheet mask
Twenty minutes under a soaked layer. A pleasant top-up, not a routine.
←5 / 5
Glycolic Acid
Toner or liquid
Swept on with a cotton pad after cleansing. Usually 5% to 10%, and easy to control.
1 / 5→
Serum
Thicker, stays put, and the format for the higher percentages. The most likely to sting.
←2 / 5→
Pads
Pre-soaked and quick to sweep over areas a dropper cannot reach.
←3 / 5→
Body lotion
Higher strengths in a moisturizing base. Skin below the neck takes far more than the face.
←4 / 5→
Wash-off peel
Left on for minutes, then rinsed. The lowest-commitment way to try a strong percentage.
←5 / 5
Only one of them behaves like an acid
Hyaluronic Acid
Hyaluronic acid is an acid only on paper. It is a humectant, a molecule that binds water. It does not exfoliate, does not sting, and does not change the pH of anything on your face.
Glycolic Acid
Glycolic acid is an acid in the way you expect. It dissolves the bonds holding dead surface cells together. That is why it tingles, why it brightens, and why it makes skin sun-sensitive.
Using them together, and in what order
Hyaluronic Acid
Order: acid first on clean skin, then hyaluronic acid, then moisturizer. Give the acid a couple of minutes to settle before anything goes over it.
Which one your skin actually needs
Hyaluronic Acid
Choose hyaluronic acid if the problem is tightness, flaking or dryness. Those need water, and an exfoliating acid will make them worse.
Glycolic Acid
Choose glycolic acid if the problem is rough, dull or congested skin. Bumpy texture, blackheads, a lack of glow and mild surface discolouration are what it does.
Common questions
Questions Patients Ask
Can I use hyaluronic acid and glycolic acid together?
Yes, and they pair well. Glycolic acid dries the skin out and hyaluronic acid puts water back, which makes the acid easier to keep using.
Which goes on first?
Glycolic acid on clean skin, then hyaluronic acid, then moisturizer. Give the acid a couple of minutes to settle before layering anything over it.
Is hyaluronic acid an exfoliant?
No. It is a humectant, which means it binds water and holds it in the surface of the skin. It does not exfoliate, sting or make skin sun-sensitive.
Which one is better for dark spots?
Glycolic acid. Hyaluronic acid does not affect pigment at all. Glycolic acid fades surface discolouration slowly, over a few months.
Do I need sunscreen with glycolic acid?
Yes, every morning. All AHAs make skin more sensitive to ultraviolet light, and skipping sunscreen undoes the brightening you are paying for.
My skin is dry and rough. Which do I start with?
Start with hyaluronic acid and a moisturizer for two weeks, then add the glycolic acid. Adding an acid to an already dry barrier is why most people abandon it in the first fortnight.