It has become the most repeated ingredient in modern skincare.
It appears in serums, creams, toners, masks and eye contours. Brands print it in bold on the packaging. Influencers recommend it without exception. And yet, there's something very few people know about hyaluronic acid: using it incorrectly can be almost as ineffective as not using it at all.
What hyaluronic acid is
Hyaluronic acid is a molecule that the body itself produces naturally.
It's found mainly in the skin, joints and eyes, and its main function is to retain water. A single hyaluronic acid molecule can hold up to a thousand times its weight in water — making it one of the most powerful humectants that exist.
The problem is that with age, sun exposure and stress, natural hyaluronic acid production declines. Skin loses its ability to retain water, becoming thinner, drier and more prone to wrinkles.
That's where hyaluronic acid comes in, in cosmetics.
How it really works
Here's the nuance most people don't know.
Hyaluronic acid doesn't hydrate the skin in the literal sense. It doesn't supply water — it attracts and retains it. It's a humectant, not a moisturizer. And that difference is key to understanding how to use it correctly.
When applied to the skin, hyaluronic acid acts like a sponge: it absorbs the water available in the environment and holds it at the skin's surface. If the environment is humid — or if the skin is damp when it's applied — the effect is excellent. If the environment is very dry and the skin is completely dry, the opposite can happen: hyaluronic acid draws water from the deeper layers of the skin up to the surface, where it evaporates.
The most common mistake
Applying it on completely dry skin.
This is the most frequent mistake, and it's why many people say hyaluronic acid "doesn't work for them." If the skin is dry and the environment is too, hyaluronic acid doesn't have enough water to attract and retain.
The solution is simple: always apply it to slightly damp skin — right after cleansing, before it fully dries — and seal it in immediately with a moisturizer that locks in that moisture.
In summer, when the environment has more humidity, hyaluronic acid works especially well. It's the perfect season to incorporate it or to get more out of it if you already use it.
How to incorporate it into your routine
Hyaluronic acid can appear in different formats — serum, toner, cream — and they all work if used correctly.
Serum — the most concentrated and effective form. It goes after the toner and before the cream. A few drops on damp skin, applied with gentle pats, not rubbing.
Toner — a good option for those who prefer a simpler routine. It rebalances the pH after cleansing and provides a first layer of hydration.
The most important thing isn't the format. It's the order — always from lightest to heaviest — and damp skin at the moment of application.
An ingredient for life
Hyaluronic acid has no significant contraindications. It's not photosensitizing, doesn't irritate, and requires no adjustment period. It's compatible with almost all other actives — vitamin C, retinol, niacinamide, acids — and works on all skin types, including the most sensitive.
In that sense, it's one of the few ingredients in modern skincare that truly deserves the term "for everyone."
As long as it's used correctly.
The Beauty Edit
Two formats, one same goal.
Facial care · Toner
Hyaluronic Toner
The first step of hydration. Rebalances the pH after cleansing and prepares the skin to better absorb what comes next.
Facial care · Serum
Aqua BOOSTER
Concentrated multi-layer hydration serum with 10% hyaluronic acid. Applied to damp skin, it replenishes water in depth and holds it for hours.