Beta-Glucan for Skin: Another Serum, or a Useful Moisturizer Ingredient?

What beta-glucan is—and why source matters

Beta-glucans are glucose-based polysaccharides, a family rather than one identical molecule. They can come from yeast, fungi, oats, and other sources; the links between glucose units, processing, solubility, and molecular size can differ. Those differences affect how a material behaves in a formula, so a result from one specific beta-glucan cannot automatically be applied to another.

In skin care, beta-glucan may help hold water at the surface. That does not prove it rebuilds damaged skin, treats inflammation, or produces lasting changes after use stops. Other ingredients also affect a moisturizer’s performance.

What human topical studies found

The human evidence is promising but narrow. In one study, 20 adults applied a gel containing 3% purified beta-glucan isolated from molasses yeast to their forearms twice daily for 14 days; a gel base was the control. Corneometer readings showed a reported 9% hydration increase with the beta-glucan gel versus 5% with the base. This was a small study of a specified yeast-derived material and short-term forearm hydration—not a test of a current face serum. Original study

A 2008 report described two randomized, double-blind, placebo-controlled trials of a chitin–beta-glucan copolymer. Thirteen volunteers with sensitive skin used 0.5–2% formulas twice daily for six weeks; a separate group of 20 men with signs of skin aging used a 1.5% formula twice daily for 16 weeks. The researchers reported increased stratum-corneum hydration in both and modestly lower water loss in the first study. Because the ingredient was a chitin–glucan blend, not beta-glucan alone, and the samples were small, it cannot isolate beta-glucan’s effect. Gautier et al., 2008

A separate 30-person randomized study tested a 2.5% chitin–glucan product on foot dryness in menopausal women with diabetes. Applied once daily for three weeks, it improved measured moisture versus placebo, with follow-up two weeks after treatment. The population, body site, and combined ingredient make this poor evidence for a general facial-serum promise. Quatresooz et al., 2009

Beta-glucan, hyaluronic acid, and colloidal oatmeal

Ingredient or product	What it is	How to read the evidence
Topical beta-glucan	A varied family of water-attracting polysaccharides	Formula- and source-specific; small human studies mostly measure hydration
Hyaluronic acid	A different water-binding molecule used in skin care	Also helps attract and hold water; no ingredient wins for everyone across products
Colloidal oatmeal	Finely processed whole oat flour with beta-glucans plus starches, proteins, lipids, and other oat components	Evidence for an oatmeal formula cannot be assigned to beta-glucan alone
Oral beta-glucan supplement	A swallowed ingredient with a different route and exposure	Supplement findings do not demonstrate what a topical formula does on skin

Both beta-glucan and hyaluronic acid can serve as humectants. Neither ingredient is a universal hydration winner. A short supplier comparison of isolated solutions under patches is not a head-to-head trial of everyday moisturizers. Supplier test conditions.

Colloidal oatmeal contains other oat components as well as beta-glucans. Its product evidence cannot be credited to purified beta-glucan alone. If you have a known oat allergy, check the whole formula and discuss suitable choices with your clinician; a source name by itself does not predict tolerance to every beta-glucan material. Oat-product review.

Topical products are not supplements

A serum is applied to skin; a supplement is swallowed. They differ in dose, route, formulation, and the biological exposure being studied. A dietary study cannot establish that a topical cosmetic will hydrate skin, and a topical hydration result does not establish a benefit from taking a supplement. This guide covers topical skin care only; it does not recommend oral beta-glucan or claim that it treats immune, metabolic, or skin disease.

One product example: beta-glucan in a moisturizer formula

Beauty of Joseon Red Bean Water Gel is an existing U.S.-marketed Korean moisturizer whose official global page lists beta-glucan in its full ingredient list. It is a 100 ml gel marketed for lightweight hydration; the directions say to cleanse, apply toner and serum, then pat on a dime-sized amount and use sunscreen during the day. Beta-glucan appears after many other ingredients in the list, and the brand does not disclose its concentration there. It is a finished formula example, not a beta-glucan-only test or proof of a specific effect. Official page checked October 31, 2026. Beauty of Joseon product page

Choosing and using a beta-glucan product

Check the exact ingredient list and directions; formulas can change. If your moisturizer keeps your skin comfortable, there is no need to add a trending ingredient. Introduce one new product at a time. Stop if persistent burning, itching, swelling, or rash develops; seek medical advice for a significant reaction.

A known allergy calls for attention to the whole product and its declared ingredients, but “mushroom-derived” or “oat-derived” on its own does not establish that someone will react to all beta-glucans. Conversely, a product’s “sensitive skin” or “allergen-free” marketing does not guarantee an individual will tolerate it. Use the label and your own allergy history, not a blanket source-based rule.

Frequently asked questions

Does beta-glucan hydrate skin?

It can function as a humectant in a formula. Small human studies found hydration changes with specific products, but that does not predict the result from every serum or moisturizer.

Is beta-glucan better than hyaluronic acid?

There is no general winner. Both can attract water; the specific forms and finished formulas matter more than a blanket ingredient ranking.

Is colloidal oatmeal the same as beta-glucan?

No. Oatmeal contains beta-glucans along with other oat components, so evidence for a colloidal-oat product cannot be credited to beta-glucan alone.

If I react to oats or mushrooms, must I avoid all beta-glucan?

Not automatically. Sources and finished formulas differ. Check the product’s full ingredient list and consider your specific allergy history; seek clinician advice when uncertain.