Hyaluronic Acid
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Hyaluronic Acid vs Lactic Acid
Hyaluronic acid does not exfoliate at all — it is a moisturizing ingredient that holds water in the surface of the skin. It treats nothing and suits every skin type. Lactic acid is a gentle exfoliating acid that lifts dead cells off the surface. They overlap in one odd way: lactic acid also draws water in, which is why it suits dry skin better than any other acid does.
At a glance
| The difference | Hyaluronic Acid | Lactic Acid |
|---|---|---|
| How long until it works | The same day | Two to four weeks |
| Cost | Inexpensive | Inexpensive |
Lactic Acid
Side by side
The differences that matter
What you do
Hyaluronic Acid
On damp skin, then seal it
A serum or lotion on slightly damp skin, with a moisturizer over the top. Used alone in dry air it can leave skin feeling tighter.
Lactic Acid
A few nights a week
A serum, toner or lotion left on the skin. Some people use it as a weekly mask 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.
Lactic Acid
Softer, less flaky skin
Less roughness, less dullness, and a slow fade of surface discolouration. Skin feels plumper rather than tighter afterwards.
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.
Lactic Acid
Keratosis Pilaris
Ammonium lactate or lactic acid lotion at around 12 percent does the same two jobs as urea, slightly more gently, and it is often the easier one to keep using daily. Good first choice if urea stings. Like everything here, it manages the bumps rather than ending them.
1 / 2→
Dry Skin (Xerosis)
Loosens stuck-together flakes chemically and draws water in at the same time, so it suits rough, bumpy dryness on the arms and legs. It is gentler than urea on large areas but stings more on cracks and on freshly shaved skin. Use it two or three times a week alongside a plain cream, not instead of one.
←2 / 2
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.
Lactic Acid
It will not unclog pores
Lactic acid cannot get into oil, so blackheads mostly stay where they are. It does nothing for oiliness either.
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
Lactic Acid
Glycolic acid
Strong evidence. Smaller molecule, faster on rough texture and dullness, and more likely to sting. Lactic acid is the more comfortable option and adds hydration.
1 / 5→
Mandelic acid
Limited evidence. Gentler again and mildly antibacterial, which suits acne-prone skin. It is slower and much less studied.
←2 / 5→
Polyhydroxy acids
Limited evidence. The mildest option, also hydrating, and they have not been shown to increase sun sensitivity. They do less.
←3 / 5→
Urea
Strong evidence. Another option for very dry and scaly skin, and often combined with lactic acid in the same product. Urea softens thickened skin without being an acid.
←4 / 5→
Salicylic acid
Strong evidence. Works inside the pore, so it is the better choice for blackheads and acne, and a poorer choice for dryness.
←5 / 5
How long until it works
Hyaluronic Acid
The same day
Hydration is immediate, and it is also short-lived, which is why it goes on daily.
Lactic Acid
Two to four weeks
Softness comes quickly. Discolouration takes a few months of steady use.
How it works, illustrated
Hyaluronic Acid
Lactic Acid
How long it lasts
Hyaluronic Acid
Hours
Water leaves the skin steadily. A moisturizer over the top slows that down.
Lactic Acid
As long as you keep using it
Dead cells build back up over a few weeks once you stop.
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.
Lactic Acid
Stinging and sun sensitivity
It can sting on freshly washed skin, and like every AHA it makes skin more sensitive to sun. Sunscreen is part of using it.
Cost
Hyaluronic Acid
Inexpensive
It is already in a large share of drugstore moisturizers and serums.
Lactic Acid
Inexpensive
Widely sold in drugstore serums and lotions. Clinic peels cost 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.
Lactic Acid
The same acid, turned down
Over-the-counter lactic acid is the same acid a clinic uses, at lower strength and a higher pH. It works slowly and without peeling. A clinic peel is the same molecule turned up.
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
Lactic Acid
Serum
Usually 5% to 10% in a light base. The gentlest of the AHA serums.
1 / 5→
Toner
Swept on after cleansing. Low strength, easy to build up slowly.
←2 / 5→
Body lotion
10% to 12% in a moisturizing base. Where lactic acid does its best work.
←3 / 5→
Ammonium lactate cream
Partly neutralized, so it is milder. Made for daily use on rough skin.
←4 / 5→
Wash-off peel
Higher strength left on for minutes, then rinsed. Not for broken or sore skin.
←5 / 5
Lactic acid is the acid that also holds water
Lactic Acid
Lactic acid is the exception. It is a humectant as well as an exfoliant, so it draws water into the skin while it loosens dead cells. That is the reason it is the AHA recommended for dry and sensitive skin.
So they are not really rivals
Hyaluronic Acid
Hyaluronic acid asks nothing of the skin. It sits in the surface layers and binds water for a few hours. There is nothing to build up to and nothing to recover from.
Lactic Acid
Lactic acid asks a little of the skin. It changes the surface, and that change takes a few weeks of regular use to show and needs sunscreen alongside it.
Using them together
Hyaluronic Acid
The hyaluronic acid is what makes the routine sustainable. Most people abandon an acid because their skin gets tight, and putting water back is the simplest way to avoid that.
Which one your skin actually needs
Hyaluronic Acid
Choose hyaluronic acid if your skin is simply tight and thirsty. If there is no roughness to remove, an acid adds risk without adding benefit.
Lactic Acid
Choose lactic acid if your skin is flaky, rough or dull. It exfoliates and hydrates at once, which is unusual and useful on dry skin.
Common questions
Questions Patients Ask
Can I use hyaluronic acid and lactic acid together?
Yes. Apply the lactic acid first, wait a couple of minutes, then hyaluronic acid and a moisturizer. There is no interaction between them.
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 is better for dry skin?
Both, in different roles. Hyaluronic acid adds water. Lactic acid removes the flakes and draws water in at the same time, which makes it the gentlest AHA for dry skin.
Does lactic acid help with dark spots?
Slowly. It fades surface discolouration over a few months by lifting pigmented cells away. It does not stop new pigment being made.
Do I need sunscreen with lactic acid?
Yes, every morning. All AHAs make skin more sensitive to ultraviolet light, and skipping sunscreen undoes the brightening.
Which one should I try first if I have never used either?
Hyaluronic acid, since it is almost impossible to irritate skin with it. Add lactic acid a couple of weeks later, two or three nights a week.