Beta-Glucan

Overview

Beta-glucan is a long-chain polysaccharide molecule made of repeating glucose units linked in a specific (1,3)/(1,6) pattern. It is found in oats, mushrooms (especially shiitake, maitake, and reishi), barley, and the cell walls of baker’s yeast. Different sources give slightly different molecular structures, but they all share the basic skin-active behaviour.

The cosmetic ingredient is sold as a viscous yellow-tan liquid solution (typically 0.5-2% beta-glucan in water with preservative) or as a fine off-white powder. The liquid form is easier to incorporate but adds water; the powder is concentrated but takes time to fully hydrate.

Beta-glucan is one of the most clinically researched soothing and barrier-support actives in cosmetics. Studies show measurable effects on wound healing, redness reduction, hydration, and skin immune response.

Shelf life is 1-2 years stored cool and dark. The liquid form is preservative-dependent and should be stored sealed.

It has been a quietly important active in dermatological skincare for decades, and is increasingly showing up in clean-beauty formulations as customers become aware of the difference between marketing-only “soothing” claims and actual evidence-backed soothing chemistry.

What it does in a formula

Beta-glucan does three things on the skin. First, it forms a hydrating film that binds water at the surface — similar to hyaluronic acid but with a different molecular shape and a more “cushioned” feel. Second, it interacts with skin immune cells (Langerhans cells) and modulates inflammatory response — this is the well-documented anti-redness and wound-healing effect. Third, it supports the skin barrier through both the hydrating film and the immune modulation.

The molecule is large and does not penetrate deeply into the skin — its action is mostly at the surface and upper layers. That is fine for its purpose.

In a formula beta-glucan also adds a slight viscosity and a smooth, silky feel.

How to use

Add to the water phase. The liquid form (most common) is heat-stable to 70 C and can be added in the water phase or cool-down. The powder form requires pre-hydration: stir into water 30-60 minutes before use and let it fully hydrate.

Usage rates by product type (liquid form, ~1% active):

• Soothing face serums: 3-10%
• Sensitive skin creams: 2-8%
• Eye creams: 2-5%
• After-sun balms and post-procedure recovery: 5-10%
• Baby balms: 3-8%
• Hand creams (winter repair): 3-8%
• Hair scalp serums: 2-5%

For powder form, use 0.1-0.5% (powder forms are concentrated).

Best for / Worst for

Best for: sensitive, reactive, and irritation-prone skin, eczema and rosacea-prone skin, post-procedure recovery, baby and toddler formulas, soothing serums, mature skin formulas.

Worst for: oil-only formulas (water-soluble), formulas where you specifically need a feeling-light finish (beta-glucan adds a small amount of viscosity), products with strongly cationic ingredients (some incompatibility).

Common pitfalls

Source confusion. Yeast-derived beta-glucan is the most studied for immune modulation; oat-derived is more focused on soothing and barrier; mushroom-derived overlaps both. Pick based on positioning. For vegan formulas avoid yeast-derived if your customer cares about that distinction.

Concentration thinking. The liquid form is typically 0.5-2% active beta-glucan. Adding 5% of a 1% solution gives 0.05% in your final formula. Read the supplier specification.

Heating powder form too late. Powder beta-glucan needs time to hydrate fully. Mix into water 30-60 minutes before formulating, or use the liquid form.

Substitutes

• Hyaluronic acid — different molecule, similar surface hydration role.
• Sodium PCA — different chemistry, similar humectant action.
• Allantoin — different chemistry, similar soothing role.
• Centella asiatica extract — different active profile, similar soothing positioning.