Pullulan
Film-forming agent and moisture-locking humectant
About Pullulan
Pullulan is a natural polysaccharide produced through the fermentation of tapioca or corn starch by the fungus Aureobasidium pullulans. In K-beauty formulations, it functions as both a film-forming agent and a moisture-locking humectant, creating an invisible, breathable layer on the skin's surface that helps seal in hydration without feeling heavy or occlusive. This dual action makes pullulan particularly valuable in serums and ampoules, where it enhances the delivery and retention of active ingredients like PDRN, retinol, and collagen peptides. With a perfect safety rating of 5/5 and a non-comedogenic rating of 0/5, pullulan is exceptionally well-tolerated across all skin types, including sensitive and acne-prone skin. Korean skincare brands have embraced pullulan for its ability to create that coveted dewy, bouncy skin texture while providing functional benefits beyond aesthetics. The ingredient works by forming a flexible, moisture-permeable film that doesn't clog pores or interfere with skin's natural respiration, which explains its presence in 91 K-beauty products on Seoul Sister, including highly-rated formulations from Anua, CKD Healthcare, and Innisfree.
How Pullulan Works
At the molecular level, pullulan consists of maltotriose units connected by alpha-1,6-glycosidic bonds, creating a unique branched structure that allows it to form thin, elastic films on the skin's surface. When applied topically, pullulan molecules arrange themselves into a cohesive network that acts as a semi-occlusive barrier, reducing transepidermal water loss (TEWL) while still allowing oxygen exchange. This film-forming property creates an immediate tightening and smoothing effect as the polysaccharide dries, which is why you'll often notice an instant glow or bounce after applying pullulan-containing serums. Simultaneously, pullulan functions as a humectant by attracting and binding water molecules from the atmosphere and underlying skin layers, holding moisture close to the skin's surface. Unlike heavier occlusive agents, pullulan's molecular structure creates a flexible, non-sticky film that moves with your skin rather than sitting on top of it. This makes it particularly effective in layering routines, as it doesn't interfere with the absorption of subsequent products while helping lock in the benefits of those applied before it.
Pullulan by Skin Type
Oily Skin
Pullulan is excellent for oily skin because it provides hydration and film-forming benefits without adding any oily residue or clogging pores (0/5 comedogenic rating). The lightweight, breathable film it creates helps control excess shine while maintaining moisture balance, which can actually help regulate sebum production over time.
Dry Skin
For dry skin, pullulan acts as a moisture-sealing barrier that prevents water loss throughout the day, making it ideal for layering under moisturizers to maximize hydration retention. Its humectant properties draw moisture to the skin's surface while the film-forming action locks it in, creating that plump, bouncy texture dry skin often lacks.
Combo Skin
Combination skin benefits from pullulan's balanced approach to hydration, as it provides moisture where needed without overwhelming oilier zones. The non-greasy, breathable film works well across different facial areas, helping normalize skin texture and moisture levels without triggering breakouts in the T-zone or leaving dry patches on cheeks.
Sensitive Skin
With a perfect 5/5 safety rating, pullulan is exceptionally gentle for sensitive skin, as it's a natural polysaccharide that rarely triggers irritation or allergic reactions. Its protective film-forming action can actually help shield sensitized skin from environmental stressors while supporting barrier function, making it a smart choice for reactive complexions.
Normal Skin
Normal skin can use pullulan to maintain its balanced state and enhance overall skin quality with that signature K-beauty glow and bounce. The ingredient works preventatively to support healthy moisture levels and protect against environmental factors that could disrupt skin's equilibrium over time.
How to Use Pullulan
- 1Apply pullulan-containing serums on damp skin immediately after toning to maximize its humectant properties and help it draw more moisture into the skin.
- 2Layer pullulan products before heavier creams or oils, as its film-forming action works best when it can make direct contact with skin and underlying water-based products.
- 3Use pullulan serums like the PDRN Bounce Ball Serum by Anua in your morning routine to create a smooth, hydrated base for makeup application that helps foundation glide on more evenly.
- 4For maximum anti-aging benefits, pair pullulan with active ingredients like retinol (as seen in Innisfree's Retinol Green Tea PDRN Skinbooster Ampoule) or PDRN, as the film-forming action helps these actives penetrate more effectively and stay active longer on the skin.
Background
Pullulan was first identified in the 1930s but didn't gain commercial significance until Japanese scientists developed efficient fermentation methods in the 1970s. The polysaccharide is produced when the yeast-like fungus Aureobasidium pullulans feeds on starch substrates, secreting pullulan as a metabolic byproduct. Originally used in the food and pharmaceutical industries for its film-forming and oxygen-barrier properties, pullulan made its way into cosmetics in the 1990s when Japanese and Korean researchers recognized its potential for skincare applications. K-beauty brands were particularly early adopters, appreciating pullulan's ability to create the dewy, glass-skin aesthetic that became central to Korean skincare philosophy. The ingredient's natural origin, exceptional safety profile, and multi-functional properties aligned perfectly with K-beauty's holistic approach to skin health, leading to its incorporation in everything from essence-type products to advanced ampoules containing cutting-edge ingredients like PDRN and low-molecular collagen.
K-Beauty Products with Pullulan
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PDRN Bounce Ball Serum
Anua
1025 Dokdo Cleansing Oil 200ml + Dokdo Cleanser 150ml Set
Round Lab
Retinol Green Tea PDRN Skinbooster Ampoule
Innisfree
1025 Dokdo Cleanser
Round Lab
Healer Turnover Active Cream Set
Rejuran
Mugtree Vegan Cookie Clay Pack Cleanser
Whipped
No. 9 NAD PDRN Glow Treatment Toner
Numbuzin
Retino Collagen Low Molecular 300 Guasha Neck Cream
CKD
Unstraum The Original Face Wash
Beplain
Collagen Jelly Cream
Medicube
Hi Amino All Powder Wash
Dewytree
Mugtree Pore Calming Gift Set (Pack Cleanser 25g + Pack Scrub 35g + Cookie Clay 35ml)
Whipped
Frequently Asked Questions
Does pullulan actually tighten skin or is it just a temporary effect?▼
Can I use pullulan products if I have fungal acne?▼
Why do K-beauty brands pair pullulan with PDRN and retinol?▼
Will pullulan make my skin feel sticky or interfere with makeup?▼
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