Beta-Glucan Guide Hydrating and Soothing Ingredient
Beta-glucan is a polysaccharide derived from oats and yeast. Applied to skin, it forms a thin moisture film that slows water loss and soothes irritation. It is widely used alongside hyaluronic acid in hydrating routines and is well tolerated by sensitive and dry skin types.
AAD guidelines · FDA 21 CFR 347 · Korean Dermatological Association · Updated July 2026
A Two-Fold Principle
How Beta-Glucan Works
01. Moisture Film
Locking In Moisture
Beta-glucan forms a thin film on the skin surface that slows the rate of water evaporation. Rather than drawing in new moisture, it holds on to the water already in skin, supporting longer-lasting hydration. Its molecular size allows it to stay well within the stratum corneum.
02. Skin Soothing
Soothing and Barrier Support
Beta-glucan is thought to bind to glucan receptors in the skin, helping to modulate the skin's inflammatory response and reduce discomfort from irritation. It is often included alongside actives such as retinol and AHA to provide a calming counterbalance.
What Is Beta-Glucan?
Beta-glucan is a polysaccharide, meaning it is built from long chains of glucose molecules. It occurs naturally in oats, barley, yeast, and certain mushrooms. In skincare, oat-derived and yeast-fermented beta-glucan are the most common. On an ingredient list, look for 'beta-glucan', 'oat beta-glucan', or 'sodium carboxymethyl beta-glucan'.
As a polysaccharide humectant, it appears frequently in the same routines as hyaluronic acid and panthenol. Beyond moisturizing, its soothing properties make it a useful addition for sensitive skin and for routines that include potentially irritating actives.
How It Works in Skin
Beta-glucan works through two main pathways.
First, it forms a moisture-retaining film. The viscous polysaccharide chains create a thin layer over the stratum corneum that slows transepidermal water loss (TEWL). Where hyaluronic acid actively draws moisture from the environment into the skin, beta-glucan is more focused on keeping what is already there.
Second, it engages glucan receptors in the skin to deliver a soothing effect. Skin contains receptors that recognize beta-1,3-glucan structures, and binding to these receptors is thought to help regulate the skin's defense response, easing irritated or reactive skin. This soothing pathway is distinct from what hyaluronic acid offers.
Why Oat-Derived Beta-Glucan Is So Common
Oats are a reliable source of beta-glucan, with high concentrations and a well-standardized extraction process. The FDA recognizes colloidal oatmeal under 21 CFR 347 as an over-the-counter skin protectant, and there is a substantial body of clinical evidence for its role in soothing skin.
Yeast-fermented beta-glucan is also widely used in cosmetics. It shares the same beta-1,3/1,6-glucan structure as the oat-derived form, and may be a better option for those with oat sensitivities.
How It Differs from Hyaluronic Acid
Property
Beta-Glucan
Hyaluronic Acid
Type
Polysaccharide (glucose polymer)
Glycosaminoglycan
Main source
Oats, yeast
Microbial fermentation
Hydration method
Moisture film (occlusion-like)
Moisture attraction (humectant)
Soothing effect
Yes (glucan receptor pathway)
Minimal
Used together
Complementary pathways; effective in combination
The two ingredients are complementary. Hyaluronic acid draws moisture in; beta-glucan creates a film that holds it there. Using both extends the duration of hydration. For skin that is irritated or reactive, beta-glucan's soothing action adds an additional benefit that hyaluronic acid does not provide.
What to Pair It With
Hyaluronic acid: Covering both moisture attraction and moisture retention in one routine. Apply hyaluronic acid first, then layer a product containing beta-glucan on top.
Ceramides: Ceramides fill lipid gaps in the stratum corneum while beta-glucan maintains surface moisture, providing layered barrier support.
Panthenol: Both ingredients are focused on soothing and hydrating, making them a natural pairing for sensitive and dry skin routines.
Retinol and AHA: Beta-glucan can help offset the dryness and mild irritation that actives sometimes cause, particularly at the start of use. Finishing a retinol step with a beta-glucan moisturizer is a common approach.
Editorial Tip
Why the Hydration Lasts
"Beta-glucan does not pull moisture in; it keeps the moisture already there from leaving. When hyaluronic acid draws water in and beta-glucan seals it with a film, hydration lasts noticeably longer. On evenings when you use retinol or AHA, finishing with a beta-glucan moisturizer can reduce the dryness that often follows."
— Beauty Dupe Editorial
How to Use It Safely
Skin type: Suitable for dry, sensitive, oily, and combination skin. Low irritation potential means it suits most skin types.
Oat allergy: Those with an oat allergy should be cautious with oat-derived beta-glucan. Yeast-derived beta-glucan carries a lower risk in that case.
Pregnancy and nursing: No known safety concerns have been reported, but consulting a dermatologist before starting any new ingredient during pregnancy is advisable.
Patch test: With any new product, apply a small amount to a limited area first and observe for 24 hours before using more widely.
The Synthesis of Wisdom
Three Things to Know About Beta-Glucan
Moisture film, soothing action, and compatibility with other actives. Understanding these three properties makes it straightforward to decide how and when to use beta-glucan in a routine.
01. Moisture Film
Moisture Film
Polysaccharide chains create a thin film over the stratum corneum that slows water evaporation. Holding on to existing moisture rather than drawing in new moisture makes it well suited to long-lasting hydration.
02. Skin Soothing
Soothing Action
Binding to glucan receptors in the skin helps modulate the skin's response to irritation. Using beta-glucan when introducing retinol or AHA can ease the discomfort that sometimes accompanies the early stages of those actives.
03. Compatibility
Works Well With Others
Beta-glucan is compatible with hyaluronic acid, ceramides, and panthenol, each working through a different pathway. There are no well-known ingredient conflicts, making it flexible to place in a variety of routines.
"
Beta-glucan works quietly. It produces no immediate sensation and draws little attention, but in a routine that uses actives, it is doing real work: holding moisture in place and keeping irritation at bay.
Beauty Dupe Editorial
Frequently Asked Questions
Which is better for hydration, beta-glucan or hyaluronic acid?
They work differently, so a simple comparison is difficult. Hyaluronic acid is a strong humectant that draws moisture from the environment into the skin, while beta-glucan forms a film on the skin surface that slows water loss. If your skin is irritated or sensitive, beta-glucan's added soothing effect may suit you better. The two work well together and complement each other.
Are products with colloidal oatmeal the same as beta-glucan products?
Similar, but not the same. Colloidal oatmeal contains beta-glucan, but it also includes lipids, proteins, vitamins, and other components. Pure beta-glucan is extracted from oats or derived from yeast fermentation, giving a more concentrated and predictable dose. For sensitive skin, isolated beta-glucan makes it easier to predict concentration and potential irritation.
Does beta-glucan help when using retinol?
It can. Retinol can cause dryness and mild irritation in the early stages of use. Beta-glucan forms a moisture barrier and provides soothing effects that may reduce this discomfort. Beta-glucan does not interfere with retinol's activity, so layering them or using a product that combines both is fine.
Is beta-glucan safe for sensitive skin?
Generally yes. Allergic reactions and irritation are uncommon, which is why beta-glucan appears frequently in products formulated for sensitive skin. For oat-derived beta-glucan, those with oat allergies should take care. Yeast-derived beta-glucan carries a lower risk in that case. A patch test before first use is recommended.
Skin Warning
Beta-glucan is generally low-irritation, but a patch test is recommended before first use. If you have an oat allergy, be cautious with oat-derived beta-glucan products. Discontinue use and consult a dermatologist if you experience redness, itching, or irritation.
References
American Academy of Dermatology — Dry Skin: Diagnosis and Treatment
FDA 21 CFR 347 — Skin Protectant Drug Products (Colloidal Oatmeal)
Korean Dermatological Association — Guidelines on Moisturizer Use
Korea Ministry of Food and Drug Safety — Cosmetic Ingredient Information (Polysaccharide Moisturizers)
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