Hyaluronic Acid / Sodium Hyaluronate
Compiled from published pharmacological and botanical literature. Not independently verified by Herbuno. Spotted an error or have a correction? Flag it below →
| Compound | Hyaluronic acid / sodium hyaluronate |
|---|---|
| Chemical class | Linear glycosaminoglycan — alternating D-glucuronic acid and N-acetylglucosamine |
| CAS | 9004-61-9 (hyaluronic acid) · 9067-32-7 (sodium hyaluronate) |
| The real specification | Molecular weight — from oligomers under 10 kDa to over 2,000 kDa |
| Topical behaviour | High MW films and holds water on the surface; low MW penetrates further |
| Water binding | Holds many hundreds of times its own weight in water |
| Claim strength | High for the MW dependence; Moderate for oral skin hydration |
| Buy from Herbuno | Hyaluronic Acid / Sodium Hyaluronate Powder |
| Origin | Processed / Sourced from India |
| MOQ | R&D 100 g / 250 g (subject to stock) · Pilot batch 1–5 kg · Bulk 10 kg, 25 kg and above |
| Lead Time | Dispatch within 72 hrs from stock · fresh-batch production (typically 50 kg+): 10 working days |
| Documentation | CoA & MSDS standard with every lot |
Name origin: Karl Meyer and John Palmer isolated it from bovine vitreous humour in 1934 and named it from the Greek hyalos, glass, for the vitreous, plus uronic acid for the sugar. It is a glycosaminoglycan: a linear, unbranched, unsulphated polymer of alternating D-glucuronic acid and N-acetyl-D-glucosamine, and the only glycosaminoglycan not covalently bound to a core protein.
Acid or salt: The free acid is poorly soluble and unstable; sodium hyaluronate, the sodium salt, is freely soluble, considerably more stable and is the commercial article in almost all cases. Product names using the two interchangeably are common, and the material supplied is nearly always the sodium salt. Specify which.
Why molecular weight is the specification: Hyaluronan's behaviour depends almost entirely on chain length, and commercial material spans more than two orders of magnitude — from oligosaccharides below 10 kilodaltons to material above 2,000 kilodaltons. High molecular weight forms a viscoelastic film and binds water on a surface; low molecular weight penetrates further into the stratum corneum; oligomers behave differently again, with some evidence of signalling activity distinct from the parent polymer. A certificate giving purity without molecular weight is not a specification.
Commercial source: Hyaluronan was historically extracted from rooster comb and bovine vitreous, which remains a vegan, halal and kosher question. Bacterial fermentation, typically using Streptococcus zooepidemicus or engineered Bacillus subtilis, is now the dominant route and the appropriate specification for certified applications. The organism matters: streptococcal routes require endotoxin and protein specification with particular care.
Evidence for Hyaluronic Acid Applications
Molecular weight determines behaviour and must be specified, which is the central technical fact. Commercial hyaluronan spans from oligosaccharides under 10 kilodaltons to polymers above 2,000, and the functional difference is not a matter of degree. High molecular weight material forms a viscoelastic hydrated film on a surface and does not penetrate meaningfully; low molecular weight material penetrates the stratum corneum further; oligomers are reported to have signalling activity that the parent polymer lacks, and in some systems high and low molecular weight hyaluronan have opposing effects on inflammatory signalling. Specifying "hyaluronic acid" without a molecular weight range leaves the function undefined. Claim strength: High.
For topical use the molecular weight choice follows the intended effect, and blends are common for that reason. A high molecular weight fraction delivers immediate surface hydration, a smoothing optical effect and film formation; a low molecular weight fraction penetrates for a deeper hydration claim; a multi-weight blend is the usual commercial answer and should be specified as a defined distribution rather than as an average, because an average of 500 kilodaltons could describe a narrow fraction or a bimodal mixture with quite different behaviour. Claim strength: High.
Oral hyaluronan works, if at all, through fragments rather than intact polymer, and the evidence is modest but real. Ingested hyaluronan is largely depolymerised by gut microbiota and absorbed as oligosaccharides, so the intact high molecular weight polymer does not reach the dermis. Controlled trials of oral hyaluronan at roughly 120 to 240 milligrams daily have reported improvements in skin hydration and in some cases wrinkle measures over eight to twelve weeks, with small sample sizes and industry sponsorship common. The proposed mechanism is fibroblast stimulation by absorbed fragments rather than substrate delivery. Claim strength: Moderate.
The water-binding capacity is real and is the basis of the humectant function, though the figures quoted are often inflated. Hyaluronan binds many hundreds of times its own weight in water through its highly hydrated extended random coil conformation, and that hydration is what produces the viscoelasticity of synovial fluid and the turgor of dermal extracellular matrix. The frequently repeated "1,000 times its weight" figure describes idealised conditions rather than performance in a formulation; actual water binding in a cosmetic matrix depends on competing humectants, electrolytes and pH. Claim strength: High for the mechanism, with the caveat on quoted figures.
Oral joint evidence is weaker than the skin evidence and weaker than intra-articular. Hyaluronan is the principal viscoelastic component of synovial fluid, and intra-articular injection has an established if debated place in knee osteoarthritis management. Oral hyaluronan trials for joint endpoints report modest and inconsistent benefits, and the depolymerisation argument applies equally here. Intra-articular evidence does not transfer to an oral product, and a joint claim on oral hyaluronan rests on a thinner base than a skin hydration claim does. Claim strength: Emerging.
The source question is a genuine certification issue rather than a historical note. Rooster comb and bovine vitreous extraction were the original commercial routes and animal-derived material persists in some supply chains, which makes the route a vegan, halal and kosher question. Bacterial fermentation is now dominant and is the appropriate specification where certification applies; where Streptococcus zooepidemicus is the organism, endotoxin and residual protein limits warrant particular attention given it is an animal-pathogenic species. Claim strength: High.
Sourcing hyaluronic acid from Herbuno. We supply sodium hyaluronate as a powder.
Specify the molecular weight range, and preferably the distribution rather than an average — it is the whole specification here, since high molecular weight material films on the surface and low molecular weight penetrates, and a 500 kilodalton average could describe a narrow fraction or a bimodal mixture. Also specify the production route: fermentation rather than rooster comb or bovine extraction, with the organism named, and endotoxin and residual protein limits stated. All lots ship with CoA and MSDS; request a quotation for pilot or bulk volumes.
Dosage & Formulator Specification
Topical inclusion is typically in the range of 0.05 to 2% depending on the molecular weight and the viscosity contribution wanted, with high molecular weight material used at the lower end because it builds viscosity rapidly. Oral doses in the skin hydration trials run roughly 120 to 240 milligrams daily over eight to twelve weeks. Intra-articular use is a medical device or pharmaceutical application and sits outside supplement or cosmetic formulation entirely.
Molecular weight should be written into the specification as a range with a distribution, not as a single figure. Require weight-average molecular weight by size-exclusion chromatography with the polydispersity or the distribution reported, because an average conceals whether the material is a narrow fraction or a mixture, and the two behave differently. For a multi-weight cosmetic blend, specify each fraction and its proportion. Intrinsic viscosity is an acceptable surrogate where molecular weight determination is unavailable, provided the measurement conditions are stated.
Handling is dominated by hydration behaviour and hygroscopicity. Sodium hyaluronate is strongly hygroscopic and will cake in an open container; store sealed with desiccant and weigh under humidity control. On addition to water it hydrates slowly and builds viscosity, and high molecular weight material lumps badly if added too fast — sprinkle onto a vortex or pre-disperse in glycerin or propylene glycol, then hydrate with gentle agitation over time rather than with high shear, since shear depolymerises the chain and changes the material you specified.
Stability in solution needs active management. Hyaluronan depolymerises with heat, with shear, at extremes of pH, in the presence of oxidising agents and free radicals, and enzymatically if hyaluronidase or some microbial contamination is present. The practical consequences: avoid prolonged heating, avoid high-shear homogenisation after hydration, hold pH in a near-neutral band, include a chelator where trace metals may catalyse radical depolymerisation, and preserve adequately because the polymer is a microbiological substrate. A finished-product molecular weight check is worth running, because the process can shift it.
For analytical control, specify sodium hyaluronate content by a method appropriate to the matrix, weight-average molecular weight and distribution, and the sodium content confirming the salt. Require glucuronic acid content or another identity confirmation. Specify protein and endotoxin limits, which matter particularly for fermentation material and especially for streptococcal routes; specify nucleic acid residue where relevant. Standard coverage includes heavy metals, microbiological limits, loss on drying and residual solvents. For cosmetic use, confirm the INCI name matches what is declared.
Two things to settle with a customer before they commit. First, whether the claim is a surface or a penetration claim, because that decides the molecular weight and the two are not interchangeable — a high molecular weight material cannot support a penetration claim and a low molecular weight one will not film. Second, for an oral product, that the mechanism is fragment-mediated rather than substrate delivery: ingested hyaluronan is depolymerised by gut microbiota and absorbed as oligosaccharides, so the intact polymer does not reach the dermis, and claims implying that it does are mechanistically wrong even where the hydration outcome data are reasonable. The intra-articular evidence likewise does not transfer to an oral product.
Frequently Asked Questions — Hyaluronic Acid / Sodium Hyaluronate
What molecular weight should I specify?
Depends on the claim, and it is the whole specification. High molecular weight — above roughly 1,000 kDa — forms a viscoelastic hydrated film and holds water on the surface without penetrating meaningfully. Low molecular weight penetrates the stratum corneum further. They are not interchangeable: high MW cannot support a penetration claim and low MW will not film.
Is an average molecular weight enough?
No. A 500 kDa average could describe a narrow fraction or a bimodal mixture of high and low material, and those behave differently. Require weight-average molecular weight by size-exclusion chromatography with the polydispersity or distribution reported, and for a multi-weight blend specify each fraction and its proportion.
Does oral hyaluronic acid reach the skin?
Not as intact polymer. Ingested hyaluronan is largely depolymerised by gut microbiota and absorbed as oligosaccharides, so the high molecular weight polymer does not reach the dermis. Trials at roughly 120 to 240 mg daily do report hydration improvements over eight to twelve weeks, with small samples and frequent industry sponsorship, but the mechanism is fibroblast stimulation by fragments, not substrate delivery.
Can I use the injection evidence for an oral product?
No. Intra-articular hyaluronan has an established if debated place in knee osteoarthritis management; oral joint trials report modest and inconsistent benefits, and the depolymerisation argument applies there too. An oral joint claim rests on a thinner base than an oral skin hydration claim does.
Any processing warnings?
Shear and heat both depolymerise it, so your process can change the molecular weight you specified. Hydrate by sprinkling onto a vortex or pre-dispersing in glycerin, then use gentle agitation over time rather than high-shear homogenisation. Hold pH near neutral, avoid prolonged heating, chelate trace metals, and preserve properly — it is a microbiological substrate. A finished-product MW check is worth running.
Is it animal-derived?
It can be. Rooster comb and bovine vitreous were the original commercial routes and animal material persists in some supply chains, so it is a vegan, halal and kosher question. Bacterial fermentation is now dominant and is the right specification where certification applies — with the organism named, and endotoxin and residual protein limits stated, particularly for Streptococcus zooepidemicus routes.