Browse almost any hydrating serum or moisturiser and you will find one of two names: Hyaluronic Acid or Sodium Hyaluronate. Many brands use the terms interchangeably in their marketing. Cosmetic chemists, however, know they are not the same molecule ? and the difference has real consequences for how a product feels, how it performs, and how stable it is on the shelf.

If you are planning to launch a serum, essence, or moisturiser that markets itself on hydration, understanding this distinction is not optional. It determines what you put on your INCI list, what your product actually does for the customer, and how your formula holds together over time.

What Are They, Exactly?

Hyaluronic acid (HA) is a naturally occurring polysaccharide ? a long chain of sugar molecules ? found throughout the human body. It is most concentrated in the skin, eyes, and joints, where it acts as a cushioning and lubricating agent. Skin naturally produces it to maintain hydration and structural support, but production declines with age.

In its pure acid form, hyaluronic acid carries a negative charge and is quite large. This size is actually the problem. The molecule is too big to cross the outer layer of skin (the stratum corneum) on its own, so it remains on the surface.

Sodium hyaluronate is the sodium salt form of hyaluronic acid. It is produced by neutralising hyaluronic acid with sodium hydroxide. The resulting molecule is smaller, more stable, and more water-soluble than its parent compound. In cosmetic formulation, sodium hyaluronate is almost always the ingredient that actually goes into the product ? even when the label or the marketing says "hyaluronic acid."

INCI note: On an ingredient label, you will see either "Hyaluronic Acid" or "Sodium Hyaluronate" depending on the exact compound used. Both are permitted INCI names. Neither is misleading ? they are simply different molecules derived from the same source. As a brand owner, knowing which one your manufacturer uses matters.

Why Molecular Weight Changes Everything

The real story is not just about the acid versus the salt. It is about molecular weight, measured in Daltons (Da) or kiloDaltons (kDa).

Hyaluronic acid in its native form has a very high molecular weight ? often between 1,000 kDa and 2,000 kDa. At this size, the molecule cannot penetrate the skin. It forms a film on top of the stratum corneum, draws moisture from the environment, and provides immediate surface hydration. This is not useless ? a good occlusive film reduces water loss ? but it is limited.

Sodium hyaluronate typically has a lower molecular weight, often in the range of 10 kDa to 300 kDa, depending on how it has been processed. Smaller molecules can penetrate more effectively into the upper layers of the dermis, delivering hydration below the skin surface rather than just on top of it.

Formulators can also work with very low molecular weight sodium hyaluronate ? sometimes called nano-hyaluronate ? with weights below 10 kDa. Research suggests these ultra-small fragments may signal fibroblasts (the cells that produce collagen) to increase their activity, though this area of science is still developing.

The practical upshot: a product using only high molecular weight HA will feel good and provide surface moisture. A product that blends multiple molecular weights ? including low molecular weight sodium hyaluronate ? gives a more layered hydration effect, working at both the skin surface and within the upper dermis.

Formulation Stability: Another Reason Sodium Hyaluronate Wins

There is a second, more pragmatic reason why sodium hyaluronate dominates cosmetic formulations: it is more stable.

Pure hyaluronic acid is hygroscopic and sensitive to pH changes. In a water-based formula, it can degrade over time, especially if the pH drifts. This shortens shelf life and creates quality control headaches for manufacturers.

Sodium hyaluronate is more resistant to both hydrolysis and oxidation. It dissolves cleanly in water, works across a wide pH range (roughly 5 to 8), and remains stable throughout a standard 24-month shelf life. For a GMP manufacturer working at scale, this reliability matters enormously.

The typical use concentration for sodium hyaluronate in cosmetic formulas is between 0.01% and 2%. Higher concentrations begin to create a sticky, gel-like texture that most consumers find unpleasant. The sweet spot for a serum is usually around 0.1% to 0.5%, balanced with other humectants such as glycerin or panthenol.

What This Means for Your Brand

If you are developing a hydrating product ? a serum, essence, toner, or moisturiser ? here are the practical decisions you need to make in conversation with your manufacturer.

Single weight or multi-weight? A single molecular weight of sodium hyaluronate is simpler and more cost-effective. Multi-weight blends cost more but deliver a noticeably more complete hydration experience. If your brand positioning is premium, multi-weight is worth the investment. If you are launching at a mid-range price point, a well-chosen single weight at the right concentration will still produce an excellent product.

What goes on your INCI list? If your manufacturer uses sodium hyaluronate, your INCI list should say "Sodium Hyaluronate." If they use pure hyaluronic acid, it reads "Hyaluronic Acid." Your marketing can use the consumer-friendly term "hyaluronic acid" regardless ? this is standard industry practice ? but your label must be accurate. Misstating the INCI name can create compliance issues with NPRA and other regulators.

How does it interact with the rest of your formula? Sodium hyaluronate works alongside most other actives without issue. It plays well with niacinamide, vitamin C, peptides, and retinol. The main consideration is pH: if your formula contains an acid (such as ascorbic acid or a low-pH AHA), confirm with your formulator that the pH is managed correctly so the HA does not degrade prematurely.

Malaysia's climate is a factor. Hyaluronic acid and sodium hyaluronate are humectants ? they work by attracting water molecules. In a humid environment like Malaysia, this is highly effective. In very low-humidity conditions (like an air-conditioned space), humectants can occasionally draw moisture from the deeper skin layers rather than the air. Pairing HA with an occlusive ingredient (shea butter, squalane, or even a small amount of wax) in your formula locks that moisture in and makes the product perform consistently regardless of the environment your customer is in.

How SKCC Laboratories Can Help

At SKCC Laboratories, we work with both high molecular weight sodium hyaluronate and low molecular weight variants, including multi-weight blends suited to premium serums. If you are unsure which grade fits your product concept and budget, our formulation team will walk you through the options ? matching the right HA grade to your target consumer, price point, and packaging format. We also handle all INCI documentation for NPRA compliance, so your label is accurate from day one.

Key Takeaways