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Glycosaminoglycans: what is their role in skin hydration?
Ingredient Guide • Hydration
Glycosaminoglycans, or GAGs, are a family of long sugar chains naturally present in the skin. They participate in the organization of its extracellular matrix and its interactions with water.
In cosmetics, the INCI Hydrolyzed Glycosaminoglycans refers to a transformed and hydrolyzed ingredient. Understanding this difference allows for an evaluation of its benefits without attributing to it the full functions of GAGs present in the dermis.
Glycosaminoglycans: The Essentials
- Glycosaminoglycans are linear polysaccharides made up of repeated sugar units.
- Hyaluronic acid belongs to this family, along with dermatan sulfate, chondroitin sulfate, heparan sulfate, and keratan sulfate.
- In the skin, several GAGs are associated with proteins to form proteoglycans.
- The INCI Hydrolyzed Glycosaminoglycans corresponds to glycosaminoglycans fragmented by hydrolysis.
- The European Commission attributes to it humectant and skin and hair conditioning functions.[1]
- Its presence does not prove dermal penetration, collagen stimulation, or a vegan origin.
Find the place of this family among other active ingredients in our hydration and skin barrier guide.
What are glycosaminoglycans in the skin?
GAGs are long carbohydrate molecules present on the cell surface and in the extracellular matrix. Their structure varies depending on the repeating sugars, their size, and their potential sulfation. Hyaluronic acid is a special case: it is not sulfated and is not attached to a protein core like most other GAGs.
In a biochemical analysis of human dermis, hyaluronic acid and dermatan sulfate were the major glycosaminoglycans, while chondroitin sulfate constituted a smaller fraction.[2] This observation describes the analyzed skin tissue; it does not mean that a hydrolyzed cosmetic mixture reproduces this composition.
GAGs can associate with proteins to form proteoglycans, which occupy specific compartments of the skin. They contribute to the mechanical and aqueous environment in which cells evolve, with functions that depend on their structure and location.
What does the INCI Hydrolyzed Glycosaminoglycans mean?
"Hydrolyzed" means that the chains have been fractured by a hydrolysis reaction, for example, using acids, enzymes, or another process. The result is therefore not a single molecule like sodium hyaluronate, but an ingredient composed of glycosaminoglycan fragments whose profile depends on the raw material.
Biological Family
The term "glycosaminoglycans" refers to several polysaccharides naturally present in tissues, with distinct structures and functions.
Cosmetic Ingredient
Hydrolyzed Glycosaminoglycans refers to a hydrolyzed material integrated into a formula for its humectant and conditioning functions.
Limited Information
The INCI alone does not reveal the exact distribution of fragments, their molecular weight, their concentration, or their source.
Finished Product Effect
The result depends on the dosage, the vehicle, and the other humectants, solvents, preservatives, and active ingredients in the formula.
What are their benefits in a cosmetic product?
1. Contribute to moisture retention
The humectant function recognized in CosIng means that the ingredient helps maintain moisture in the product or in contact with the superficial layer of the skin.[1]
2. Improve skin conditioning
A conditioning agent contributes to the feel and surface appearance. In a mist, it can contribute to a softer, less rough sensation after application.
3. Complement a network of humectants
Hydrolyzed GAGs can be combined with glycerin, Sodium PCA, betaine, and various forms of hyaluronic acid in the same aqueous formula.
4. Integrate into light textures
Their use in a mist helps reinforce the moisturizing profile without adding a significant oily phase, which is of interest to skins seeking lightness.
These superficial cosmetic functions do not allow for the assertion that the ingredient reconstitutes the extracellular matrix. Even for topical hyaluronic acid, evidence of deep penetration remains uncertain according to a synthesis of literature on cutaneous GAGs.[4]
How do they contribute to hydration?
In living skin, glycosaminoglycans are part of a complex network with cells, matrix proteins, and water. In a cosmetic, hydrolyzed glycosaminoglycans are delivered to the surface in a much simpler vehicle. It is therefore necessary to separate the two levels of action.
- In skin tissue: Endogenous GAGs contribute to the extracellular matrix, its organization, and its water management.
- In the formula: The hydrolyzed ingredient participates in moisture retention and the sensory behavior of the product.
- On the surface: It can support the suppleness of the stratum corneum in combination with other humectants.
- In the routine: A cream can complement this aqueous phase with emollients and lipids.
A study on 32 samples of sun-protected human skin observed age-related variations for several GAGs and proteoglycans, including a decrease in hyaluronic acid and heparan sulfate markers in older groups.[3] This biological finding does not demonstrate that a cosmetic containing hydrolyzed GAGs reverses these changes.
Glycosaminoglycans, Hyaluronic Acid, Sodium PCA or Glycerin?
| Ingredient | Nature | Main role | What the INCI doesn't say |
|---|---|---|---|
| Hydrolyzed GAGs | Mixture of fragments derived from glycosaminoglycans. | Humectant and skin conditioning. | Exact composition, size, origin, and concentration. |
| Hyaluronic acid | Unsulfated glycosaminoglycan, available in several forms. | Humectation and surface film depending on the form. | The precise molecular weight when not communicated. |
| Sodium PCA | Sodium salt of PCA, associated with skin NMF. | Humectant and skin conditioner. | Its percentage and the effect of the entire formula. |
| Glycerin | Very common small humectant polyol. | Attract and retain water in the superficial layer. | Its exact origin and dosage. |
Hyaluronic acid is therefore a specific member of the GAG family, while Hydrolyzed Glycosaminoglycans refers to a broader hydrolysate. Glycerin and Sodium PCA belong to other chemical families.
Which skin types are they suitable for?
- Dehydrated skin: A blend of several humectants can address water deficiency and feelings of tightness.
- Combination or oily skin: An aqueous mist offers a light step, without alone predicting the risk of breakouts.
- Dry skin: A cream containing emollients should generally complement the mist to provide more comfort.
- Mature skin: Surface hydration can temporarily make dehydration lines less visible.
- Sensitive skin: Primarily examine the complete formula, especially the presence of alcohol and fragrance.
A humectant ingredient does not automatically make every product soothing or suitable for sensitivities. Texture, other components, and individual reaction are paramount.
How to use a glycosaminoglycans mist?
- Gently cleanse the skin. Avoid excessive aggressive cleansing that accentuates the feeling of dryness.
- Spray the mist onto clean skin. Keep your eyes closed and maintain the application distance indicated on the product.
- Allow to penetrate or gently pat. It is not necessary to keep the skin constantly damp to benefit from the formula.
- Apply your serum then your cream. Humectants benefit from being integrated into a routine that also provides emollients when the skin needs them.
- Finish with sun protection in the morning. Glycosaminoglycans do not filter UV rays.
A well-tolerated hydrating mist can generally be used morning and evening, or occasionally throughout the day, according to its instructions for use. If it contains fragrance or alcohol, reduce the frequency in case of discomfort.
With which ingredients to associate them?
- Hyaluronic acid: to combine the hydrolysate with two forms of a more precisely identified cosmetic GAG.
- Sodium PCA: to enrich an aqueous phase with a humectant associated with the natural moisturizing factor.
- Glycerin: to complete the humectant profile with a small, versatile molecule.
- Betaine: to add a humectant osmolyte to a light formula.
- Aloe vera: to build an aqueous product focused on freshness, suppleness, and comfort.
- Lipids and ceramides: to supplement water with a step more adapted to the skin barrier.
Deepen your understanding of hydrating ingredients with guides on betaine and aloe vera for the face.
What mistakes to avoid?
Confusing family and ingredient
Skin GAGs constitute a complex biological family. The hydrolyzed INCI is a specific cosmetic material, whose exact composition is not detailed by its name alone.
Promising deep penetration
The word "hydrolyzed" indicates fragmentation, but does not prove diffusion to the dermis. Fragment size, vehicle, and specific tests would be necessary.
Saying they rebuild the matrix
Surface humectation and conditioning are not equivalent to replacing endogenous GAGs or guaranteed collagen stimulation.
Deducing origin or vegan status
The INCI is not sufficient to identify the animal, biotechnological, or synthetic source. This information must be confirmed with the brand or supplier.
Which Luminesse product contains hydrolyzed glycosaminoglycans?
The exact INCI name Hydrolyzed Glycosaminoglycans appears in only one individual formula in the Luminesse catalog. This precision avoids attributing the ingredient to products that do not contain it.
Dew Mist — the multi-humectant prebiotic mist
Dew Mist combines hydrolyzed glycosaminoglycans with betaine, Sodium PCA, glycerin, hydrolyzed hyaluronic acid, and sodium hyaluronate. Its formula also contains a Lactobacillus ferment, rhamnose, glucose, and glucuronic acid.
This architecture illustrates the supporting role of hydrolyzed GAGs: they do not solely carry the entire moisturizing promise but are integrated into a network of several humectants. The INCI list also includes alcohol and fragrance, which should be considered for reactive skin types.
Find Dew Mist in the Dehydration Routine, the Sensitivity & Redness Routine and the Complete Morning Routine.
Compositions may change. Always consult the INCI list on the packaging received before use.
What precautions should be taken?
The CosIng sheet specifies the cosmetic functions of the ingredient, but does not alone guarantee the tolerance of each finished product. A formula must be evaluated as a whole, with its dosage, preservative system, fragrance, and conditions of use.
- Perform a patch test if your skin reacts easily to scented cosmetics.
- Avoid spraying directly into the eyes and follow product instructions.
- Do not use the ingredient as a substitute for treating a skin condition.
- Discontinue use and seek advice in case of a significant or persistent reaction.
Frequently Asked Questions about Glycosaminoglycans
Are glycosaminoglycans hyaluronic acid?
Hyaluronic acid is a glycosaminoglycan, but not all glycosaminoglycans are hyaluronic acid. The family also includes dermatan, chondroitin, heparan, and keratan sulfate.
What does "hydrolyzed" mean?
It means that the long chains have been broken down by hydrolysis. This transformation produces smaller fragments, without alone proving their exact size or depth of penetration into the skin.
Can they be used every day?
A moisturizing product containing them can generally be used daily if well tolerated. Follow its instructions for use and adjust the frequency to the complete formula, especially when it contains alcohol or fragrance.
Are they suitable for sensitive skin?
The ingredient is used as a humectant and conditioner, but sensitivity depends on the finished product. Check the entire INCI list and patch test if your skin is very reactive.
Are hydrolyzed glycosaminoglycans comedogenic?
An isolated score does not predict imperfections. They are incorporated into the aqueous phase, but the behavior on acne-prone skin depends on the vehicle, other ingredients, and individual response.
Are they always vegan?
No. Their origin can vary depending on the raw material and the process. The INCI name alone does not certify a plant, biotechnological, or synthetic source; check the specific product commitment.
What percentage should be sought?
There is no universal percentage to classify products. The nature of the hydrolysate, its dosage, other humectants, and tests on the finished formula must be considered together.
Scientific and Institutional Sources
- European Commission, CosIng database. "Hydrolyzed Glycosaminoglycans", functions: humectant, skin and hair conditioning. Consult CosIng sheet.
- Gillard G. C. et al. "A comparison of the glycosaminoglycans of weight-bearing and non-weight-bearing human dermis", Journal of Investigative Dermatology, 1977. Consult PubMed notice.
- Oh J. H. et al. "Changes in glycosaminoglycans and related proteoglycans in intrinsically aged human skin in vivo", Experimental Dermatology, 2011. Consult PubMed notice.
- Wang S. T. et al. "Glycosaminoglycans: Sweet as Sugar Targets for Topical Skin Anti-Aging", Clinical, Cosmetic and Investigational Dermatology, 2021. Consult scientific article.
Informative article dedicated to topical cosmetic use. It does not replace a diagnosis or medical advice. Last editorial review: September 2026.
