Ingredient review
Lactobacillus/Schizosaccharomyces Ferment Filtrate
INCI: LACTOBACILLUS/SCHIZOSACCHAROMYCES FERMENT FILTRATE
A gentle, probiotic-derived ferment that helps strengthen the skin barrier and support a healthy microbiome without irritation.
In plain English
This ingredient is made by fermenting sugars with two types of friendly bacteria and yeast. The resulting liquid is filtered to create a concentrate rich in amino acids, peptides, and other skin-friendly compounds. It helps keep your skin's surface balanced and resilient, similar to how yogurt supports gut health.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- biotech
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Lactobacillus/Schizosaccharomyces 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 Lactobacillus/Schizosaccharomyces 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
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A fermented filtrate produced by culturing Lactobacillus (a probiotic bacteria) and Schizosaccharomyces (a type of yeast) together. The fermentation process breaks down nutrients into smaller, more absorbable molecules that can benefit the skin.
How it works
When applied to the skin, the filtrate delivers peptides, amino acids, and organic acids that help maintain a healthy pH, support the skin's natural microbiome, and strengthen the moisture barrier. It also provides gentle exfoliation and hydration without stripping the skin.
Pros
Gentle on sensitive skin
Unlike harsh exfoliants, this ferment filtrate supports the skin barrier without causing irritation or redness, making it suitable for daily use even on reactive skin.
Supports microbiome health
By providing prebiotic-like compounds, it helps beneficial skin bacteria thrive, which can reduce breakouts and improve overall skin resilience.
Cons and cautions
Limited research depth
While fermentation-based ingredients are widely used in K-beauty, there are fewer peer-reviewed clinical studies specifically on this dual-ferment blend compared to single-strain ferments.
Potential for mild purging
In rare cases, the gentle exfoliating effect from organic acids may cause a temporary increase in breakouts for those new to fermented skincare.
Best for
- People with sensitive or reactive skin looking for gentle barrier support
- Anyone wanting to incorporate probiotic skincare into their routine
Use caution if
- Those with a known allergy to fermented ingredients or yeast
Usage tips
Safety summary
Considered safe for topical use with a very low risk of irritation. No significant safety concerns have been reported in cosmetic concentrations.
Research notes
Evidence is largely based on ingredient-level studies and traditional use in fermented skincare. Human clinical data is limited but supportive of barrier-support and microbiome benefits.
Common label clues
- Typical concentration
- 1–10% in leave-on products
- Regulatory status
- Generally recognized as safe for cosmetic use in the US and EU; no specific restrictions.
- Common uses
- Serums, Moisturizers, Toner, Essences
- Environmental note
- Fermentation is a low-energy, sustainable production method that reduces waste compared to chemical synthesis.
Good to know
- This ingredient is often found in Korean beauty essences and serums.
- It is vegan-friendly and typically free of common allergens.
Common questions
What is Lactobacillus/Schizosaccharomyces Ferment Filtrate in beauty products?
This ingredient is made by fermenting sugars with two types of friendly bacteria and yeast. The resulting liquid is filtered to create a concentrate rich in amino acids, peptides, and other skin-friendly compounds. It helps keep your skin's surface balanced and resilient, similar to how yogurt supports gut health.
What does Lactobacillus/Schizosaccharomyces Ferment Filtrate do in a beauty product?
When applied to the skin, the filtrate delivers peptides, amino acids, and organic acids that help maintain a healthy pH, support the skin's natural microbiome, and strengthen the moisture barrier. It also provides gentle exfoliation and hydration without stripping the skin.
Is Lactobacillus/Schizosaccharomyces Ferment Filtrate safe for most people?
Considered safe for topical use with a very low risk of irritation. No significant safety concerns have been reported in cosmetic concentrations.
Who should be careful with Lactobacillus/Schizosaccharomyces Ferment Filtrate?
Those with a known allergy to fermented ingredients or yeast
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.