What Is Aureobasidium Pullulans Ferment Filtrate?
Aureobasidium Pullulans Ferment Filtrate comes from a type of yeast-like fungus called Aureobasidium pullulans, part of the Dothioraceae family. During fermentation the microorganism feeds on a plant-based growth medium and releases a mix of natural sugars, proteins and minerals into the liquid. Once the process is complete the broth is filtered to remove cells, leaving a clear filtrate rich in humectant polysaccharides such as pullulan along with amino acids and trace elements that help support skin moisture.
The cosmetic world became interested in this filtrate in the early 2000s when Korean and Japanese laboratories started exploring fermented ingredients for their skin-friendly properties. Pullulan, already known for forming flexible moisture-locking films in food and pharma uses, drew attention for giving skincare formulas a smooth feel and quick-lifting effect. By refining the full ferment instead of isolating just the pullulan, brands gained a broader set of skin-conditioning benefits.
Production is straightforward and eco-friendly. The fungus is cultured in stainless-steel tanks with water, glucose and plant extracts at controlled temperature and pH. After several days the liquid is sterilised then micro-filtered to remove residue, creating a stable, water-soluble ingredient ready for cosmetic blending.
You will most often find Aureobasidium Pullulans Ferment Filtrate in lightweight moisturisers, hydrating essences, sheet masks, anti-aging serums, soothing after-sun gels and barrier-support creams aimed at sensitive or dehydrated skin.
Aureobasidium Pullulans Ferment Filtrate’s Cosmetic Benefits/Uses
This multitask ferment supports both instant and long-term skin comfort.
- Humectant – draws water from the air and deeper skin layers to the surface, boosting hydration levels and giving the complexion a plump fresh look without tackiness
- Skin Conditioning – smooths rough patches, softens texture and helps active ingredients spread evenly, which can make formulas feel more elegant and less greasy
- Skin Protecting – forms a light breathable film that shields against pollution particles and slows moisture loss, helping maintain a resilient skin barrier throughout the day
Who Can Use Aureobasidium Pullulans Ferment Filtrate
The filtrate is gentle, water based and lightweight which makes it suitable for almost every skin type. Dry or dehydrated skin benefits from its moisture-binding sugars while oily or combination skin appreciates the non greasy finish. Sensitive or compromised barriers usually tolerate it well because it does not contain common irritants or fragrances. There are no major concerns for acne prone skin since the ingredient is non occlusive and does not feed the yeast that triggers fungal breakouts.
Aureobasidium Pullulans Ferment Filtrate is produced by fermenting a microscopic fungus in plant derived media without any animal components so products containing it are typically vegan and vegetarian friendly. Always check the full ingredient list though because other ingredients in the same formula might not be.
No data points to specific risks for pregnant or breastfeeding women when the ingredient is used topically at normal cosmetic concentrations. Still this is not medical advice and anyone who is pregnant or nursing should ask a healthcare professional before adding new skincare to their routine just to be safe.
The filtrate does not increase photosensitivity and can be used both day and night without raising the risk of sunburn. It layers well with most actives and can be combined with SPF, retinoids, vitamin C or exfoliating acids without known issues.
Potential Side Effects/Adverse Reactions
Reactions to topical Aureobasidium Pullulans Ferment Filtrate differ from person to person. The points below outline potential side effects that could occur in rare cases; most users will not experience them when the ingredient is properly formulated and preserved.
- Redness or mild stinging a transient sensation that may appear on very reactive or recently exfoliated skin
- Allergic contact dermatitis an uncommon immune response leading to persistent itching rash or swelling
- Eye irritation possible if a product accidentally gets into the eyes since the filtrate is not meant for the ocular area
- Interaction with poorly preserved formulas if a product is contaminated the nutritive nature of the filtrate could allow microbial growth which in turn may irritate skin
If any irritation swelling or discomfort develops discontinue use and seek medical advice if symptoms do not quickly subside.
Comedogenic Rating
Rating: 0/5. Aureobasidium Pullulans Ferment Filtrate is water soluble and consists mainly of lightweight sugars and amino acids that do not block pores or leave an oily film, so it is considered non-comedogenic. That makes it a comfortable choice for people who are prone to acne or breakouts. Because the filtrate is usually used at low percentages and is easily rinsed from the skin, its pore-clogging potential remains minimal even in richer formulas. Keep in mind that overall comedogenicity depends on the full ingredient list, so heavier oils or waxes in the same product could still trigger congestion.
Summary
Aureobasidium Pullulans Ferment Filtrate works as a humectant, skin-conditioning and skin-protecting agent. The ferment’s pullulan and other natural sugars pull moisture into the upper layers of skin, amino acids smooth roughness and a soft invisible film slows water loss while shielding against pollution. Although not yet as mainstream as hyaluronic acid, interest is growing thanks to the wave of fermented K-beauty ingredients that promise a dewy finish without greasiness. Safety data show it is well tolerated with very low irritation or allergen risk, but as with any new skincare ingredient it is wise to patch test a product before regular use just to be safe.