Sodium Hyaluronate
Also known as: Hyaluronic acid, sodium salt, Sodium HA, SH
The salt form of hyaluronic acid — smaller molecules, deeper delivery, and the real ingredient behind most 'HA' serums.
In short
Sodium hyaluronate is the sodium salt of hyaluronic acid (HA) — the same water-binding glycosaminoglycan in a smaller, water-soluble form that penetrates skin more effectively than high-molecular-weight HA. It is the form used in most cosmetic 'hyaluronic acid' serums, where it binds up to 1,000 times its weight in water, plumping the stratum corneum and reducing the appearance of fine lines. It is also used in eye drops and joint injections, though supplement-grade oral forms target joints and skin hydration. Clinical evidence for topical short-term hydration is solid; the effects are temporary and require consistent use. Multiple molecular weights in one formula give the best combined surface and deeper effect.
- Sodium salt of hyaluronic acid; smaller and more penetrable
- Binds up to ~1,000x its weight in water
- The actual form in most 'HA' serums
- Topical effect: real but temporary — daily use required
What is Sodium Hyaluronate?
When a serum label says 'hyaluronic acid,' the ingredient list usually says sodium hyaluronate — and that distinction matters. Sodium hyaluronate is HA's salt form: lower molecular weight, water-soluble, and able to get where plain HA cannot, while holding enormous amounts of water along the way. The visible result is the famous 'plump' effect — instant, temporary, and entirely dependent on continued use and sufficient environmental humidity. Understanding sodium hyaluronate means understanding that it is a maintenance ingredient, not a structural fix.
Where it comes from
Natural sources
- Sodium salt of hyaluronic acid, a natural glycosaminoglycan of skin, joints, and eyes
- Produced commercially by fermentation (Streptococcus) or rooster-comb extraction (legacy)
- Available in a spectrum of molecular weights
How it's made
Cosmetic grades from 5 kDa to 2 MDa; used at 0.1–2% in serums, creams, and eye drops.
What it does in products
Benefits
Immediate skin hydration
strong evidenceTrials show measurable short-term increases in stratum-corneum hydration and reduced roughness with topical use.
Fine-line plumping
strong evidenceThe hydration-driven smoothing effect is well documented, though it fades without continued application — a cosmetic, not structural, benefit.
Barrier support in dry conditions
moderate evidenceRegular use reduces transepidermal water loss and improves tolerance of retinoids and acids in many formulations.
Side effects & safety
Safety considerations
- Considered safe topically; standard in pregnancy-safe skincare.
- None — pairs well with most actives, especially after exfoliants.
- Not for: None
How it's used
In supplements
Oral forms (60–240 mg) target joint and skin hydration with limited evidence; topical is the standard route.
In skincare
0.1–2%; apply to damp skin and seal with a moisturizer to prevent water loss.
Regulatory status
- Cosmetic ingredient; also used in FDA-regulated eye drops and injectable devices.
- INCI name on cosmetic labels: Sodium Hyaluronate.
- Assessed as safe in cosmetics.
Popular products containing Sodium Hyaluronate
- The Ordinary Hyaluronic Acid 2% + B5 — Multi-weight sodium hyaluronate serumThe Ordinary · Skincare
- CeraVe Hydrating Hyaluronic Acid Serum — HA plus ceramidesCeraVe · Skincare
- Neutrogena Hydro Boost Water Gel — Hyaluronate-anchored gel moisturizerNeutrogena · Skincare
Product names and brands are shown for reference and belong to their respective owners.
Molecular weight strategy
High-molecular-weight HA sits on the surface, forming a hydrating film; low-molecular-weight sodium hyaluronate penetrates deeper. Modern formulas blend weights — the 'multi-molecular' approach — to get both the surface glow and deeper hydration in one product.
The humidity caveat
Hyaluronate pulls water from wherever is wetter. In humid air it draws from the environment; in very dry climates or indoor heating, it can draw from deeper skin — which is why application to damp skin and sealing with an occlusive is the standard usage protocol.
Frequently asked questions
Is sodium hyaluronate the same as hyaluronic acid?
It is the salt form — chemically related, but lower molecular weight and more penetrable. Most cosmetic 'hyaluronic acid' is sodium hyaluronate.
Can I use it with retinol?
Yes — it is a standard pairing, hydrating skin made more vulnerable by retinoids and improving tolerability.
Do HA serums work permanently?
No — effects are hydration-based and temporary. Results last while you use the product daily.
The bottom line
Sodium hyaluronate is the workhorse humectant behind modern hydration serums — effective, safe, and temporary by design, with usage technique deciding between glow and disappointment.
References
- Hyaluronic acid and sodium hyaluronate in dermatology. PubMed Central. https://pubmed.ncbi.nlm.nih.gov/31856872/
- Molecular weight and skin penetration of hyaluronate. PubMed. https://pubmed.ncbi.nlm.nih.gov/29105077/
- Hyaluronic acid — cosmetic ingredient review. CIR. https://www.cir-safety.org/ingredients