Ingredient review
Pullulan Ferment Filtrate
INCI: AUREOBASIDIUM PULLULANS/OLIVE OIL FERMENT FILTRATE
A gentle, fermented ingredient that helps hydrate and soothe the skin while supporting a healthy moisture barrier.
In plain English
This ingredient is made by fermenting olive oil with a friendly yeast called Aureobasidium pullulans. The fermentation process creates a liquid that's rich in skin-friendly compounds like amino acids, sugars, and fatty acids. When applied to the skin, it helps attract and hold moisture, calms irritation, and supports the skin's natural protective barrier. Think of it as a nourishing, probiotic-style boost for your skin's surface.
Quick decision guide
Useful, but context matters
Pullulan Ferment Filtrate is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Pullulan Ferment Filtrate.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A biotech-derived filtrate produced by fermenting olive oil with the yeast Aureobasidium pullulans. The resulting liquid contains a mix of beneficial metabolites, including polysaccharides, peptides, and lipids.
How it works
The fermentation process breaks down olive oil into smaller, more skin-compatible molecules. These molecules help reinforce the skin's moisture barrier, reduce water loss, and provide a soothing effect. The polysaccharides in the filtrate also form a light film on the skin, helping to lock in hydration without feeling heavy.
Pros
Gentle hydration boost
The polysaccharides in this ferment help attract moisture to the skin's surface, providing a light, non-greasy layer of hydration that feels comfortable even on sensitive skin.
Supports skin barrier
By delivering fatty acids and other barrier-supporting compounds, this ingredient can help strengthen the skin's natural defenses against dryness and environmental stressors.
Cons and cautions
Limited research
While the individual components (olive oil, pullulan) are well-studied, there are few peer-reviewed studies specifically on this combined ferment filtrate, so its unique benefits are not fully proven.
Variable effectiveness
The quality and potency of the ferment can vary between brands and batches, meaning the results you see may depend heavily on the specific product formulation.
Best for
- People with dry or dehydrated skin looking for gentle hydration
- Those with sensitive or easily irritated skin who want a soothing ingredient
Use caution if
- Individuals with a known allergy to olives or olive oil (rare but possible)
Usage tips
Safety summary
This ingredient has a low irritation and comedogenic risk based on its composition and typical use levels. Allergic reactions are rare but possible in individuals with olive allergies. As with any new ingredient, a patch test is recommended for those with very sensitive skin.
Research notes
Research on Aureobasidium pullulans ferment filtrates is still emerging. Most evidence comes from studies on pullulan (a polysaccharide produced by the yeast) and olive oil's skin benefits. Direct studies on the combined ferment are limited, but existing data on the individual components support its hydrating and soothing potential.
Common label clues
- Typical concentration
- 1–5% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Serums, Moisturizers, Essences, Sheet masks
- Environmental note
- The fermentation process is considered a sustainable method of production, using renewable plant-based oils and requiring less energy than some synthetic alternatives.
Good to know
- This ingredient is often found in K-beauty and J-beauty products focused on gentle, fermented skincare.
- It is generally well-tolerated by most skin types, including acne-prone skin, due to its low comedogenic risk.
Common questions
What is Pullulan Ferment Filtrate in beauty products?
This ingredient is made by fermenting olive oil with a friendly yeast called Aureobasidium pullulans. The fermentation process creates a liquid that's rich in skin-friendly compounds like amino acids, sugars, and fatty acids. When applied to the skin, it helps attract and hold moisture, calms irritation, and supports the skin's natural protective barrier. Think of it as a nourishing, probiotic-style boost for your skin's surface.
What does Pullulan Ferment Filtrate do in a beauty product?
The fermentation process breaks down olive oil into smaller, more skin-compatible molecules. These molecules help reinforce the skin's moisture barrier, reduce water loss, and provide a soothing effect. The polysaccharides in the filtrate also form a light film on the skin, helping to lock in hydration without feeling heavy.
Is Pullulan Ferment Filtrate safe for most people?
This ingredient has a low irritation and comedogenic risk based on its composition and typical use levels. Allergic reactions are rare but possible in individuals with olive allergies. As with any new ingredient, a patch test is recommended for those with very sensitive skin.
Who should be careful with Pullulan Ferment Filtrate?
Individuals with a known allergy to olives or olive oil (rare but possible)
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.