Common Name(s): Beta-glucan,pumpkin-derived polysaccharide,dectin-1 immune modulator

CAS Number: N/a

DESCRIPTION

What It Does: Pumpkin fruit extract beta-glucan reduces inflammatory redness and itch through immune receptor activation, improves barrier function by forming a breathable polysaccharide film that reduces trans-epidermal water loss, and moisturises skin through the multiple hydroxyl groups on the glucan backbone that form hydrogen bonds with water molecules — providing comprehensive sensitive skin, anti-aging, and barrier repair benefits from one biopolymer.

Why It's Used: Formulators choose pumpkin fruit extract beta-glucan because it provides clinically validated immune modulation in addition to conventional humectant and film-forming benefits that are achievable with simpler polymers like hyaluronic acid. the dectin-1 receptor activation pathway provides genuine anti-inflammatory benefits rather than just passive moisture retention — making beta-glucan formulations clinically differentiated in eczema care, post-procedure recovery, and reactive skin lines. the pumpkin-derived origin also provides authentic natural sourcing narratives.

How It Works: Beta-glucan works through three mechanistic pathways: (1) immune modulation — the (1→3)(1→6)-β-d-glucan polymer backbone is a pamp (pathogen-associated molecular pattern) recognised by dectin-1 receptors on skin dendritic cells and macrophages. at cosmetic concentrations, dectin-1 signalling promotes m2 (anti-inflammatory, reparative) macrophage polarisation over m1 (pro-inflammatory) while triggering il-10 production — a key anti-inflammatory cytokine. this trained immunity response reduces pro-inflammatory cytokine production in sensitised skin; (2) humectancy — the dense hydroxyl groups on the glucan repeat units form hydrogen bonds with multiple water molecules per glucose unit (approximately 5–7 water molecules per glucose), creating a hygroscopic water-binding matrix in the sc; (3) fibroblast stimulation — β-glucan fragments activate β1-integrin receptors on dermal fibroblasts triggering map kinase signalling → tgf-β1 → collagen i and iii synthesis — the same pathway underlying wound healing promotion by β-glucan in clinical wound dressings.

Typically Found In: Immune modulating skin care,barrier repair,eczema-calming

TECHNICAL DETAILS

Primary Category: Active ingredient – skin microbiome support

Secondary Functions: Microbiome balance,prebiotic effect

Application Areas:

Typical Concentration Range: 0.01%–2%

SOURCING & ETHICS

Vegan Status: Yes

Halal Status: Yes

Source Notes: Fermentation-derived or plant-extracted.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Non-irritating; beneficial for sensitive skin.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Excellent safety profile. ewg score: 1.

Works Well With: Ceramides,niacinamide,soothing actives

Avoid Combining With: No significant incompatibilities

SCIENTIFIC NOTE

Dectin-1 activation concentration optimisation: at very high β-glucan concentrations, dectin-1 activation can trigger inflammatory signalling (the immune system perceiving high glucan = active fungal infection). at low cosmetic concentrations (0.01%–1%), dectin-1 activation triggers the 'training' tolerogenic response rather than the full inflammatory cascade. formulation at the anti-inflammatory rather than immunostimulatory concentration is critical — the same β-glucan providing anti-inflammatory activity at 0.1% could provide pro-inflammatory activity at 5%. dose-dependent receptor signalling switching determines clinical outcome.

Last Verified: Cosing database,beta-glucan dectin-1 immune modulation clinical review

Primary Sources: 2026-03-12