Beta-Glucan: The Quietly Effective Ingredient Having Its Moment

Not every skincare trend deserves scrutiny. Beta-glucan is one of the exceptions — an ingredient that has been used in wound-healing research and medical-grade skincare for decades, now arriving in mainstream K-beauty and J-beauty formulations to considerable, and in this case largely justified, enthusiasm. If you have seen it appearing on ingredient lists with increasing frequency in 2025 and 2026, this article explains what it is, what it actually does, and why it is worth seeking out.

What is beta-glucan?

Beta-glucan is a polysaccharide — a complex carbohydrate — found naturally in oats, barley, yeast, and certain fungi including Saccharomyces cerevisiae (baker's yeast) and mushrooms such as Tremella (snow mushroom) and reishi. In skincare, the most commonly used form is beta-1,3/1,6-glucan derived from yeast, which has a well-characterised interaction with skin receptors called Dectin-1. This receptor interaction promotes repair, reduces inflammation, and stimulates the production of key structural proteins.

As a humectant, beta-glucan holds moisture effectively — with some research suggesting it outperforms hyaluronic acid for surface-level hydration, though the two are complementary rather than competitive. Beta-glucan's molecular structure allows it to form a film on the skin surface that reduces transepidermal water loss while simultaneously interacting with deeper skin receptors.

The evidence base

Research on beta-glucan in wound healing dates to the 1980s. A 2005 study by Pillai et al found that topical beta-glucan produced statistically significant improvement in fine lines and skin roughness compared to vehicle control after eight weeks. More recent research has focused on its immunomodulatory effects — its ability to calm inflammatory responses in sensitised or reactive skin — making it of particular interest for post-procedure care and for barrier-compromised skin.

Beta-glucan in K-beauty and J-beauty

Snow mushroom extract — Tremella fuciformis sporocarp — is Asian beauty's most prized source of beta-glucan, used in traditional medicine across the region for centuries. In skincare, snow mushroom polysaccharides function similarly to hyaluronic acid but with additional soothing properties and, some research suggests, better moisture retention at low humidity. Brands such as Innisfree, Purito, and I'm From have incorporated beta-glucan and snow mushroom into hydrating serums and essences at relatively high concentrations.

How to use it

Beta-glucan requires no careful pH management, strict layering protocols, or cautious introduction period. It can be applied morning or evening, layered with virtually any other ingredient, and used by those who cannot tolerate retinoids or high-concentration acids. If you are rebuilding a disrupted skin barrier — after over-exfoliation, active treatment, or a sensitivity flare — beta-glucan is among the most evidence-supported choices for the recovery phase.