Hyaluronic Acid Explained

HA · Multi-weight hyaluronic acid

Hyaluronic acid is a humectant: in a suitable formula it helps the top layers of skin hold on to water. Evidence varies by formula and concern.

Evidence: strong

Label names (INCI): Sodium Hyaluronate, Hyaluronic Acid, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate Crosspolymer, Sodium Acetylated Hyaluronate

Written by the Oliareen editorial teamDermatologist review: pendingLast updated: 6 November 2026How we write

Myth vs fact

Myth: Hyaluronic acid replaces a moisturiser.
Fact: No. It draws water in, but oils and other moisturiser ingredients keep that water from escaping. In dry or air-conditioned air, hyaluronic acid on its own can leave skin feeling tighter.

What it is

Skin makes hyaluronic acid naturally. Labels usually list Sodium Hyaluronate or Hydrolyzed Hyaluronic Acid, which are different molecule sizes.

What it does

It holds water at the surface, so skin feels plumper and softer right after applying. Some studies found better hydration after several weeks of regular use. Any effect on fine lines is small and temporary.

Often discussed for

This doesn't mean everyone with these needs it.

Concerns

Skin types

How to approach it

Many people apply it to slightly damp skin and follow with a moisturiser. It comes in serums, toners and creams; the formula matters most.

Morning or evening

Any time of day. Sealing it with a moisturiser matters more than the timing.

If you're new to it

This is usually easy to add, but patch test any new product first. Don't start several new things at once, or you won't know which one caused a problem.

General education, not a diagnosis or treatment plan.

Works well with

Examples of common pairings, not guaranteed combinations.

Fits most routines

Use carefully with

Stacking several actives raises the risk of irritation. If you're on any prescribed medicine, ask your doctor before adding an active.

Seal with a moisturiser in dry or air-conditioned air
Safe in pregnancy

Possible reactions

Reactions are uncommon, but anyone can be allergic to any ingredient, and the trouble often comes from something else in the formula, such as fragrance. Stop if you get a red rash, itching or burning. Swelling of the face, lips or eyes, or trouble breathing, needs urgent medical care.

When to see a doctor

Evidence and timing

Evidence: Evidence: strong
Time to see a change (weeks): 0 plumping; 2-8 hydration/elasticity

Evidence comes from studies of specific formulas and strengths. Your product may behave differently.

Questions people ask

Is hyaluronic acid okay for oily skin?

Yes, it isn't an oil. Oily skin can still be dehydrated, and a light gel texture can feel comfortable.

Why does my skin feel tight after using it?

That can happen in very dry air or without a moisturiser on top. Seal it with a moisturiser.

Does it remove wrinkles for good?

No. Holding water can make lines look softer for a while, but the effect is temporary.

Sources

Pavicic T et al. J Drugs Dermatol 2011;10(9):990-1000 (76 women, 60 d, 5 molecular weights)
Bukhari SNA et al. / Draelos review 2023