Sodium Hyaluronate vs. Hyaluronic Acid: What’s the Difference?

If you have ever flipped a skincare bottle around, squinted at the back label, and wondered why it says both “sodium hyaluronate” and “hyaluronic acid” - you are not alone. It is one of the most common points of confusion on any INCI list, and it is exactly the kind of thing that most brands gloss over. Not here.

This guide covers everything you need to know about sodium hyaluronate vs. hyaluronic acid: what each ingredient actually is, how they differ at a molecular level, why the best formulas use both, how to decode your skincare labels like a pro, and which INKEY products use all four forms of the hyaluronic acid family. By the end, you will be able to read any serum’s ingredients list and know exactly what you are looking at.

A quick note on the name INKEY: it comes directly from the INCI list — the International Nomenclature of Cosmetic Ingredients — the standardized system that legally governs how ingredients are named on every product you buy. That is not a coincidence. It is the whole point. Knowledge-powered skincare starts with understanding what is actually in your products.

Shop the hero products featured in this guide:

Hyaluronic Acid Serum — from $10 / 30ml. Contains both sodium hyaluronate and hyaluronic acid in a 2% multi-molecular complex.
Ectoin Hydro-Barrier Serum — $15 / 30ml. Contains all four forms of hyaluronic acid alongside 2% Ectoin and 3 Ceramides.

What Hyaluronic Acid Actually Is — and What It Is Not

Before the comparison can land properly, you need to understand what hyaluronic acid is on its own terms. And there is one myth to clear up immediately: despite the word “acid” in the name, hyaluronic acid is not an exfoliating acid. It does not peel, it does not resurface, and it will not make your skin sting. The word “acid” here simply describes its molecular classification — a polysaccharide chain — not its behavior on the skin.

Hyaluronic acid, often shortened to HA, is a substance your body produces naturally. It is found throughout the human body — in the skin, in joint fluid, in connective tissue, in the eyes. Its primary biological job is to attract water molecules and hold them in place. And it is remarkably good at it: hyaluronic acid can bind up to 1,000 times its own weight in water. Think of it as a moisture magnet operating at a molecular level.

As we age, the body’s natural production of hyaluronic acid declines significantly. The plump, dewy skin associated with youth is, in large part, a reflection of abundant HA. As levels drop, so does skin’s capacity to retain moisture — which is why dehydration lines, dullness, and a loss of elasticity tend to appear with age. This is not just cosmetic marketing; it is straightforward biology. It is also why topical HA has become one of the most widely used ingredients in skincare globally.

Quick facts on hyaluronic acid:

What it is: A naturally occurring polysaccharide (sugar molecule) found in skin, joints, and connective tissue
What it does: Attracts and binds water; acts as a humectant
Who it is for: All skin types — dry, oily, combination, sensitive, mature
Key property: Can hold up to 1,000x its own weight in water
What it is NOT: An exfoliating acid; does not strip, peel, or irritate

Now here is an important functional distinction that will come up again throughout this guide: hyaluronic acid hydrates— it draws water into the skin. A moisturizer locks that water in, forming a barrier that prevents it from evaporating off the skin surface. These are two different steps. HA pulls moisture in; a moisturizer seals it there. You need both — and you need them in that order. For a deeper look at why hydration and moisturization are not the same thing, this breakdown of the difference between moisturizing and hydrating covers it in full.

One practical application tip that makes a genuine difference: always apply HA-containing products to damp skin, not dry skin. Hyaluronic acid is a humectant — it needs available moisture to work with. If you apply it to completely dry skin in a dry environment, it has nothing to draw from at the surface and may pull from deeper skin layers instead. Splash your face, pat lightly, and apply your serum while your skin still has that faint dampness to it. It is a small change with a noticeable effect.

Hyaluronic acid is compatible with essentially every other skincare active — it does not clog pores, does not interact negatively with retinol, vitamin C, niacinamide, or AHAs, and does not irritate even the most sensitive skin. If you are curious whether you actually need HA in your routine right now, these five signs you need hyaluronic acid serum are worth a read. For the complete deep dive on the ingredient itself, visit our complete Hyaluronic Acid ingredient guide.

With the foundation in place, the natural next question is: if hyaluronic acid already exists and does all of this, what exactly is sodium hyaluronate — and why does it keep appearing on labels?

What Sodium Hyaluronate Is — and Why It Matters More Than You Think

Sodium hyaluronate is the sodium salt form of hyaluronic acid. That sentence is precise and important: it is derived from hyaluronic acid, but it is not identical to it. The “sodium” prefix tells you it has been converted into a salt form, which changes two things about how it behaves — its molecular weight and its stability in a formula.

On the INCI list, you will see it written as Sodium Hyaluronate. You might also encounter it labelled as “hyaluronate sodium,” “hyaluronic acid sodium salt,” or “hyalurone sodium.” Occasionally a product label will read “hyaluronic acid (as sodium hyaluronate)” — which is entirely accurate and just a more transparent way of acknowledging the relationship between the two. All of these names refer to the same ingredient.

The critical difference between sodium hyaluronate and hyaluronic acid comes down to molecular weight. Hyaluronic acid has a high molecular weight — its molecules are large. Large molecules cannot penetrate the outer layer of skin; they sit on top of it. This is not a flaw. Sitting at the surface, high-molecular-weight HA forms a moisture-retaining film across the skin, delivering immediate visible plumping, smoothing surface texture, and preventing transepidermal water loss. The results are fast and perceptible — you can feel the difference within minutes of applying a product that contains it.

Sodium hyaluronate has a significantly lower molecular weight. Its molecules are smaller. And smaller molecules can do something large ones cannot: they can penetrate into the epidermis — the top layer of the skin — and deliver hydration from within the deeper skin layers rather than just at the surface.

According to Healthline, medically reviewed by Dr. Sara Perkins, MD: “Sodium hyaluronate has a lower molecular weight than hyaluronic acid. It’s small enough to penetrate the epidermis, or top layer of the skin. In turn, it can improve hydration from the underlying skin layers.”

This is why sodium hyaluronate appears on so many skincare labels. Not only does it penetrate more deeply, but it is also more stable in cosmetic formulations than pure hyaluronic acid — it is less susceptible to oxidation, which means it survives the manufacturing process better and delivers more consistent results over the shelf life of the product.

Did you know? The ingredient listed as “hyaluronic acid” on many skincare labels is often actually sodium hyaluronate. Both names can legally and accurately refer to the same source ingredient — the difference lies in molecular form, not quality or efficacy. This is not misleading labeling. It is standard INCI nomenclature. Sodium hyaluronate IS derived directly from hyaluronic acid. They are the same family; they are not the same molecule.

One more form to know at this stage: hydrolyzed sodium hyaluronate. This is sodium hyaluronate that has been further broken down into even smaller molecular fragments through a hydrolysis process. Its molecules are tiny enough to penetrate even deeper than standard sodium hyaluronate — targeting the lowest accessible layers of the epidermis and providing the most durable hydration layer of all. It appears less commonly on labels than standard sodium hyaluronate, but when it is present, it represents the deepest-working form of HA available in topical skincare. If you are dealing with chronically dehydrated skin, the presence of hydrolyzed sodium hyaluronate in a formula is a meaningful signal. For more on building a full routine around deep hydration, this skincare routine for dehydrated skin covers the approach in detail.

Now that both ingredients have been defined individually, it is time for the side-by-side — the comparison readers come here for.

Sodium Hyaluronate vs. Hyaluronic Acid: The Key Differences Explained

Here is the head-to-head breakdown. Both ingredients are humectants. Both attract and hold water. Both are derived from the same biological source. But they are not interchangeable, and understanding the distinctions tells you a great deal about why formulators choose to use them together.

Source and origin

Both hyaluronic acid and sodium hyaluronate come from the same place. Hyaluronic acid is a naturally occurring molecule in the body, and in cosmetics it is typically produced through bacterial fermentation (usually using Streptococcus bacteria). Sodium hyaluronate is derived directly from hyaluronic acid — it is the sodium salt form. Same origin. Different molecular form.

Molecular weight

This is the defining difference. Hyaluronic acid has a high molecular weight — its molecules are large. Sodium hyaluronate has a lower molecular weight — its molecules are smaller. Hydrolyzed sodium hyaluronate is smaller still. Molecular weight determines penetration depth, which determines where in the skin each ingredient does its work.

Where each ingredient works

Hyaluronic acid (high molecular weight) sits predominantly at the skin surface. It does not penetrate significantly into the epidermis. Instead, it forms a moisture-retaining film across the surface, visibly plumping the skin and preventing water from evaporating off.
Sodium hyaluronate (lower molecular weight) penetrates into the epidermis. It delivers hydration to deeper skin layers, providing moisture that lasts beyond the surface and supports the skin’s hydration levels over time.
Hydrolyzed sodium hyaluronate (very small molecular fragments) penetrates deepest of all, reaching the lower layers of the epidermis for maximum, durable moisture retention.

Speed of results vs. lasting effect

Hyaluronic acid delivers fast, visible, tactile results — you can feel the surface plumping and smoothing almost immediately. Sodium hyaluronate delivers slower, deeper, more cumulative hydration. Together, they cover both the immediate and the sustained. This is precisely why Medical News Today notes that hyaluronic acid “works better at hydrating the surface of the skin, whereas sodium hyaluronate can reach deeper layers, due to its lower molecular weight” — and that combining both is the approach that gives you full-spectrum coverage.

Stability in formula

Sodium hyaluronate is more stable in cosmetic formulations than pure hyaluronic acid. It is less prone to oxidation, meaning it survives the formulation process more reliably and delivers consistent results throughout the product’s shelf life. This is one of the primary reasons sodium hyaluronate appears more frequently on INCI lists than hyaluronic acid in its pure form.

Is sodium hyaluronate better than hyaluronic acid?

No. And that is the point. Neither is superior to the other — they simply work at different depths and deliver different types of hydration. The gold standard is a formula that uses both, delivering moisture at the skin surface and within the deeper epidermal layers simultaneously. This is what is called a multi-molecular approach, and it is the approach INKEY takes in both hero products featured in this guide.

The short answer to “Is sodium hyaluronate the same as hyaluronic acid?”:

They share the same origin but work differently in the skin. Sodium hyaluronate is the smaller, deeper-working form of hyaluronic acid. Hyaluronic acid is the larger, surface-working form. The best formulations use both — which is exactly what the INKEY Hyaluronic Acid Serum does, listing both Sodium Hyaluronate and Hyaluronic Acid in its INCI, and what you will find across the full hyaluronic acid collection.

At a glance, here is what separates them:

Hyaluronic Acid: Large molecule → surface film → instant plumping → immediate visible results → moisture barrier
Sodium Hyaluronate: Smaller molecule → penetrates epidermis → deeper hydration → lasting moisture from within → more stable in formula
Hydrolyzed Sodium Hyaluronate: Even smaller → deepest penetration → most durable hydration → targets lower epidermal layers

The deeper you go into the HA family, the more complex the picture becomes. Which leads naturally to the next section — because there are not two forms of HA in skincare. There are four.

The Full Hyaluronic Acid Family: All Four Forms You Will See on Labels

Most skincare brands talk about “hyaluronic acid” as a single ingredient. A few mention sodium hyaluronate. Fewer still explain that there are actually four distinct forms of the HA molecule that appear in skincare formulations — each one working at a different depth, delivering hydration through a different mechanism, and providing a different type of benefit.

Understanding all four forms does two things: it makes you a smarter shopper, and it explains exactly why some serums are dramatically more effective at delivering lasting, multilayered hydration than others. Here is the full breakdown, from the surface down.

1. Hyaluronic Acid (High Molecular Weight)

This is the form most people picture when they hear “hyaluronic acid.” Its large molecules cannot penetrate the skin’s outer barrier, so they work at the surface — forming a thin, invisible moisture-retaining film across the skin. That film does two things: it pulls moisture from the environment toward the skin, and it slows transepidermal water loss (TEWL), keeping the hydration already in the skin from evaporating. The results are immediate — you can feel the surface plumping and smoothing within minutes of application. This is the form responsible for the tactile sensation of “glass skin” that makes HA serums feel so satisfying to use.

2. Sodium Hyaluronate (Low-to-Medium Molecular Weight)

As covered above, sodium hyaluronate’s smaller molecular size allows it to penetrate into the epidermis, delivering hydration to deeper skin layers rather than just sitting at the surface. It is the most commonly listed HA form on INCI lists because it is the most stable in formulation and the most versatile in terms of what it can deliver. When you see “Sodium Hyaluronate” near the top of an INCI list, you are looking at a meaningful concentration of a well-understood, effective hydrating ingredient.

3. Hydrolyzed Sodium Hyaluronate

Hydrolyzed sodium hyaluronate is created by breaking sodium hyaluronate down into even smaller molecular fragments — a process called hydrolysis. The result is a form of HA that penetrates more deeply than any other standard topical form, reaching the lower layers of the epidermis. Research into molecular weight and skin penetration confirms that smaller molecular fragments achieve greater penetration depth, which translates into the most durable and long-lasting layer of hydration available from a topical product. If you have genuinely dehydrated skin that does not seem to respond to standard hydrating serums, the presence of hydrolyzed sodium hyaluronate in a formula is a meaningful differentiator.

4. Sodium Hyaluronate Crosspolymer

This is the most functionally distinct form of the four. Sodium hyaluronate crosspolymer is a modified, cross-linked version of sodium hyaluronate — meaning the HA chains have been chemically linked together in a three-dimensional network structure. This cross-linked architecture slows the release of moisture from the ingredient, turning it into an extended-release hydration system. Rather than delivering all its moisture at once (the way surface-acting HA does), sodium hyaluronate crosspolymer releases moisture gradually and consistently over time — keeping the skin hydrated hours after application, not just at the point of use. Think of it as the slow-burn, sustained version of the HA family.

Together, these four forms cover the full depth spectrum — from the skin surface all the way down to the deepest layers of the epidermis — and the full time spectrum, from immediate visible results to extended, sustained hydration. A formula that combines all four is delivering multi-level, multi-timing hydration that no single-form product can match.

The four forms of hyaluronic acid — at a glance:

Hyaluronic Acid — Works at skin surface / Instant plumping and moisture film
Sodium Hyaluronate — Penetrates epidermis / Deep hydration, stable in formula
Hydrolyzed Sodium Hyaluronate — Deepest penetration / Most durable moisture
Sodium Hyaluronate Crosspolymer — Extended-release / Prolonged, sustained hydration

The INKEY Ectoin Hydro-Barrier Serum is one of very few formulas that contains all four of these forms in its INCI list: Hydrolyzed Sodium Hyaluronate, Sodium Hyaluronate, Sodium Hyaluronate Crosspolymer, AND Hyaluronic Acid. That is a genuinely uncommon formulation choice, and it is worth understanding why it makes a difference — which this guide will cover in the product section. If you want to understand the other hero ingredient in that serum, what ectoin is and what it does is worth reading alongside this guide.

Having decoded the full HA family, the next step is practical: what does all of this actually look like on the labels of the products sitting in your bathroom cabinet?

How to Read Your Skincare Labels: Decoding the INCI List Like a Pro

The INCI list — the International Nomenclature of Cosmetic Ingredients — is the standardized global system used to name every ingredient in every cosmetic product. It is a legal requirement in both the US and the UK, and it appears on every single skincare product you have ever bought. INKEY’s name comes directly from this system — it is not just a brand aesthetic; it is a statement about what the brand is built around: the ingredients list, explained clearly, without anything hidden.

Here is what you need to know to read it effectively.

Ingredients are listed in descending order of concentration. The ingredient at the very top of the list is present in the highest amount. The ingredient at the very bottom is present in the smallest amount. This is the single most important rule for evaluating whether an ingredient is actually doing something meaningful in a formula or just appearing as a label claim.

When you are looking for hyaluronic acid family ingredients, look for any of the four names covered in the previous section: Hyaluronic Acid, Sodium Hyaluronate, Hydrolyzed Sodium Hyaluronate, and Sodium Hyaluronate Crosspolymer. Where they appear on the list tells you a great deal about how much of them is actually in the product.

Common shopper confusion — and the myth that needs busting:

A product can market itself as a “hyaluronic acid serum” on its front label while listing “Sodium Hyaluronate” — not “Hyaluronic Acid” — on the INCI. This is not misleading. It is not a substitution. Sodium hyaluronate IS the sodium salt of hyaluronic acid, and it is the most commonly used form of HA in cosmetic formulations precisely because it is more stable and effective in that context. The brand is giving you the same family of ingredient in its most functional form. What matters is not whether the label says “hyaluronic acid” or “sodium hyaluronate” — what matters is where it appears in the INCI list and how many forms are present.

What to look for in a quality HA formulation:

Multiple HA forms on the INCI list. If you see more than one of the four forms — Sodium Hyaluronate, Hyaluronic Acid, Hydrolyzed Sodium Hyaluronate, Sodium Hyaluronate Crosspolymer — you are looking at a multi-molecular formula that hydrates at multiple depths. That is the gold standard.
Position in the list. HA family ingredients appearing in the top half of the INCI list indicate a meaningful concentration. HA appearing in the last three to five ingredients is likely a trace amount added for label credibility, not functional hydration.
A moisturizer following the serum. HA pulls moisture in; it needs to be locked in. Whatever you apply after your HA serum should act as a moisture seal. Without that step, some of that hydration can evaporate — especially in drier environments.

To make this concrete, here is what the INCI list of the INKEY Hyaluronic Acid Serum looks like in practice:

Water (Aqua/Eau), Propanediol, Sodium Hyaluronate, Glycerin, Butylene Glycol, Phenoxyethanol, Ammonium Acryloyldimethyltaurate/VP Copolymer, Leuconostoc/Radish Root Ferment Filtrate, Hyaluronic Acid...

Both Sodium Hyaluronate and Hyaluronic Acid appear in the top portion of the list — confirming that both are present in meaningful concentrations, not as trace additions. That is multi-molecular HA formulation in action, readable directly from the label.

The INKEY Ectoin Hydro-Barrier Serum takes this further: all four forms of HA — Hydrolyzed Sodium Hyaluronate, Sodium Hyaluronate, Sodium Hyaluronate Crosspolymer, and Hyaluronic Acid — appear in its INCI list. Reading that label tells you, without any marketing language, that you are getting hydration at every depth simultaneously.

Label reading checklist — what to look for:

Does the formula contain more than one form of HA or sodium hyaluronate? (Multi-molecular = better depth coverage)
Where do the HA ingredients appear in the INCI list? (Higher position = greater concentration)
Is sodium hyaluronate listed where the front label says “hyaluronic acid”? (Normal and correct — same family)
Does your routine include a moisturizer after the serum? (Essential for locking HA hydration in)

For a broader exploration of how hydration and moisturization work together in a routine — and why you need both — the difference between moisturizing and hydrating is the next read. And if you want to browse everything INKEY formulates with HA, the full hyaluronic acid collection is the place to start.

Armed with the ability to decode any label, it is time to look at the two INKEY products that put all of this science to work — and understand how to build a hydration-first routine around them.

INKEY’s HA Serums and How to Build a Hydration-First Routine

This section is not a sales pitch. It is a usage guide — because understanding what a product contains is only half the picture. Understanding how to use it, and why, is what actually moves the needle for your skin.

The INKEY Hyaluronic Acid Serum — $10 / 30ml

The INKEY Hyaluronic Acid Serum is the straightforward daily hydration choice for all skin types. Its INCI list confirms what the label promises: both Sodium Hyaluronate and Hyaluronic Acid are present in its top-tier 2% Multi-Molecular Hyaluronic Acid complex, working at the surface and within the epidermis simultaneously.

It also contains Matrixyl 3000 Peptide — a peptide complex that supports the appearance of firmer, smoother skin over time, making this serum more than a one-note hydration product. The clinical numbers back this up: 82% of users agreed their skin felt firmer, smoother, and more elastic after four weeks of use. 86% agreed the serum absorbs quickly, feels lightweight, and is not tacky on the skin. It has picked up Allure Best of Beauty 2022, CEW 2023, and Glamour recognition, and holds a 4.7-star average across over 3,000 reviews.

How to use it: Apply morning and evening to damp, cleansed skin. Use a pea-sized amount — a little goes further than you think. Pat it gently into the skin rather than rubbing. Follow with any active treatments, then seal everything in with a moisturizer. In the morning, finish with SPF. The key move, as mentioned earlier, is damp skin — it maximizes the HA’s ability to draw available moisture into the surface layers.

This serum is the hydration baseline for any routine. Dry skin, oily skin, combination, sensitive, or mature — it works across all of them. It does not interact negatively with any other actives, which means it layers cleanly with retinol, vitamin C, niacinamide, and everything in between. If you have oily skin and have been avoiding hydrating serums, hyaluronic acid is genuinely compatible — dehydrated oily skin often overproduces sebum to compensate for a lack of water-based hydration.

The INKEY Ectoin Hydro-Barrier Serum — $15 / 30ml

The Ectoin Hydro-Barrier Serum is the more targeted choice — for sensitive, reactive, dehydrated, or barrier-compromised skin that needs more than hydration alone. It contains all four forms of hyaluronic acid: Hydrolyzed Sodium Hyaluronate, Sodium Hyaluronate, Sodium Hyaluronate Crosspolymer, and Hyaluronic Acid. That is the full depth spectrum of HA-based hydration in a single product.

Alongside the 2.5% Multi-Molecular Hyaluronic Acid complex, it contains 2% Ectoin — a naturally occurring extremolyte compound that does two things simultaneously: it reinforces and repairs the skin barrier while providing its own hydration. And it contains a 1% Barrier Blend of three ceramides, which are lipid molecules that make up a significant portion of the skin’s natural barrier structure. Together, ectoin and ceramides address the structural integrity of the barrier itself — not just the surface hydration level. For readers who want to go deeper on what ectoin is and why it matters, the full ectoin ingredient guide is the reference to start with.

The clinical results are compelling: clinically proven to hydrate and strengthen the barrier within 15 minutes of application. Visible bounce restored in three days. Visible improvement in five signs of a compromised skin barrier in four weeks. It holds a 4.6-star average across over 400 reviews.

How to use it: Apply morning and evening to cleansed skin as the first serum step, before other treatments. Follow with any additional actives, then moisturizer.

Using Both Together — and Knowing Which One You Actually Need

These two serums are complementary, not redundant. They address different problems with overlapping tools.

Which INKEY HA serum is right for you?

All skin types, daily hydration, starting point for any routine: → Hyaluronic Acid Serum ($10)
Sensitive, reactive, barrier-compromised, dry, or flaky skin: → Ectoin Hydro-Barrier Serum ($15)
Maximum hydration and barrier support: → Use both, applying the Ectoin Serum first, the HA Serum second.

If you choose to layer both: the Ectoin Serum goes first — it works at the barrier level and sets the foundation. The HA Serum follows, adding surface and epidermal hydration on top of that barrier-reinforced base. Layering more than one serum? Apply this hydrating serum first for max absorption.

At a glance — the two serums compared:

Hyaluronic Acid Serum ($10)
HA Forms: Sodium Hyaluronate + Hyaluronic Acid
Key actives: 2% Multi-Molecular HA + Matrixyl 3000
Best for: All skin types, daily hydration
Clinical result: 82% report firmer skin in 4 weeks

Ectoin Hydro-Barrier Serum ($15)
HA Forms: All four — Hydrolyzed SH + SH + SH Crosspolymer + HA
Key actives: 2% Ectoin + 2.5% HA + 3 Ceramides
Best for: Sensitive, barrier-compromised, or dehydrated skin
Clinical result: Barrier strengthened in 15 minutes

Your Questions Answered: FAQ on Sodium Hyaluronate and Hyaluronic Acid

These are the questions that come up most often. Answered directly, without padding.

Is sodium hyaluronate the same as hyaluronic acid?

They come from the same source — sodium hyaluronate is the sodium salt form of hyaluronic acid. Related, but not identical. The key differences are molecular weight and penetration depth. Hyaluronic acid works at the skin surface; sodium hyaluronate penetrates into the epidermis for deeper hydration. Both are humectants. The best formulas use both together.

Is sodium hyaluronate better than hyaluronic acid?

Neither is better. They work at different depths and deliver different types of hydration. HA delivers immediate surface plumping and a moisture-retaining film. Sodium hyaluronate penetrates deeper for lasting, internal hydration. Together in a multi-molecular formula, they cover what neither can do alone.

What does sodium hyaluronate do for skin?

It hydrates the skin from within the epidermis. As a humectant, it attracts water and retains it in the deeper skin layers — reducing dehydration, improving skin feel, supporting a healthier-looking complexion over time, and reducing the appearance of dehydration lines. For building a full routine around this kind of deep hydration, this skincare routine for dehydrated skin is worth reading.

Why does my product say “hyaluronic acid” on the front but list “sodium hyaluronate” on the INCI?

Completely standard and entirely legitimate. Sodium hyaluronate is derived from hyaluronic acid and is the most stable, most commonly used form in cosmetic formulations. A product that describes itself as a hyaluronic acid serum while listing sodium hyaluronate on its INCI is being accurate, not deceptive. It is the same family of ingredient, in its most functional topical form. What to check is where it appears on the list — that tells you how much is actually in there.

What is hydrolyzed sodium hyaluronate?

Hydrolyzed sodium hyaluronate is sodium hyaluronate that has been broken down into even smaller molecular fragments through a hydrolysis process. Its very small molecular size allows it to penetrate more deeply than standard sodium hyaluronate, reaching the lower layers of the epidermis to provide the deepest, most durable layer of hydration available from a topical product.

Can you use sodium hyaluronate every day?

Yes — both sodium hyaluronate and hyaluronic acid are extremely well-tolerated, non-irritating, and completely safe for daily use morning and evening. There is no adjustment period, no risk of overuse, and no skin type that needs to avoid them. They are also considered safe during pregnancy and breastfeeding. The Hyaluronic Acid Serum is formulated specifically for twice-daily use.

What is sodium hyaluronate crosspolymer?

It is a modified, cross-linked form of sodium hyaluronate. The crosspolymer structure slows the release of moisture into the skin, functioning as an extended-release hydration system that keeps the skin hydrated over a prolonged period — not just at the moment of application. It is one of the four forms of HA found in the INKEY Ectoin Hydro-Barrier Serum.

Should I apply hyaluronic acid to wet or dry skin?

Damp skin — always. Applying HA family ingredients to slightly damp skin gives the humectants something to work with at the surface, maximizing how much moisture they can draw in. On completely dry skin in a dry environment, they may pull moisture from deeper layers instead of the surface. Cleanse, pat lightly, and apply your serum while there is still faint dampness on your skin. Always follow with a moisturizer to seal the hydration in.

Do I need both a hyaluronic acid serum and the ectoin serum?

Not necessarily. If your primary concern is daily hydration for a generally healthy, non-reactive skin barrier, the Hyaluronic Acid Serum covers it completely. If your skin is sensitive, reactive, dry and flaky, or showing signs of a compromised barrier — redness, tightness, increased sensitivity to products — the Ectoin Hydro-Barrier Serum is the more targeted choice. Used together, they provide maximum hydration and barrier reinforcement simultaneously, with the Ectoin Serum applied first.

What You Now Know — and What to Do Next

Sodium hyaluronate and hyaluronic acid are not the same ingredient — but they work from the same source, toward the same goal, through different mechanisms. Hyaluronic acid works at the skin surface, delivering immediate plumping and forming a moisture-retaining film. Sodium hyaluronate penetrates into the epidermis, providing deeper and more lasting hydration. Hydrolyzed sodium hyaluronate goes deepest. Sodium hyaluronate crosspolymer delivers moisture over a sustained period rather than all at once.

None of these forms is better than the others. They are complementary. And that is exactly why multi-molecular HA formulations — those that combine more than one form — represent the gold standard in hydration science. More depth of coverage. More layers addressed. Better results.

When you read a skincare label, look for how many HA forms are present and where they appear in the INCI order. A product with “sodium hyaluronate” near the top of the list is giving you a meaningful dose of an effective, penetrating humectant — even if the front label says “hyaluronic acid.” That is not misleading. That is just how INCI nomenclature works.

You now know more about these two ingredients than most skincare consumers ever will. Use that knowledge every time you pick up a new product.

Shop the products in this guide

Hyaluronic Acid Serum — from $10
2% Multi-Molecular Hyaluronic Acid. Sodium Hyaluronate + Hyaluronic Acid confirmed in INCI. Matrixyl 3000 Peptide. All skin types. 4.7 stars.

Ectoin Hydro-Barrier Serum — $15
All four HA forms. 2% Ectoin. 3 Ceramides. Barrier strengthened in 15 minutes. 4.6 stars.

Not sure which routine is right for your skin? Take the INKEY Skincare Quiz for a personalized recommendation built around your skin type and concerns.

Browse the full Hyaluronic Acid collection to see every INKEY product formulated with HA — and read the INCI list on every single one.