Ingredient review
Peppermint Ferment Filtrate
INCI: Saccharomyces/Peppermint Leaf Ferment Filtrate
A gentle fermented ingredient that may help soothe and condition skin, though research is still emerging.
In plain English
This ingredient is made by fermenting peppermint leaves with a type of yeast called Saccharomyces. Fermentation breaks down the plant material into smaller, potentially more skin-friendly compounds. The result is a liquid that can be added to skincare products to help calm and condition the skin. It's a trendy ingredient in K-beauty and clean beauty, but it's not a powerhouse active — think of it as a supportive, soothing addition rather than a star performer.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- biotech
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Peppermint 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 Peppermint 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 filtrate obtained from fermenting peppermint (Mentha piperita) leaves with Saccharomyces yeast. The fermentation process produces a liquid rich in amino acids, peptides, and other bioactive compounds from the peppermint.
How it works
The fermentation process breaks down peppermint leaf components into smaller molecules that may be more easily absorbed by the skin. The resulting filtrate can provide antioxidant and soothing benefits, while the yeast-derived peptides may support skin barrier function. However, the exact mechanisms are not fully established in human studies.
Pros
Gentle soothing potential
The fermentation process may create compounds that help calm minor skin irritation, making it suitable for sensitive skin types when formulated properly.
Antioxidant support
Peppermint leaves contain natural antioxidants like rosmarinic acid, which may help protect skin from environmental stressors.
Cons and cautions
Limited research
There are very few peer-reviewed studies specifically on Saccharomyces/Peppermint Leaf Ferment Filtrate, so its benefits are largely based on general fermentation and peppermint knowledge.
Potential for irritation
Peppermint contains menthol and other compounds that can be irritating for some people, especially in higher concentrations or on compromised skin.
Best for
- Those looking for a gentle, fermented ingredient to support skin comfort
- People interested in K-beauty or fermented skincare trends
Use caution if
- Individuals with known sensitivity or allergy to peppermint or mint family plants
Usage tips
Safety summary
This ingredient is considered safe for cosmetic use at typical concentrations. However, individuals with peppermint allergies or very sensitive skin should patch test first. The fermentation process may reduce some irritancy compared to raw peppermint extract, but caution is still warranted.
Research notes
Direct research on Saccharomyces/Peppermint Leaf Ferment Filtrate is scarce. Most evidence comes from studies on Saccharomyces ferments in general and peppermint leaf extract separately. Peppermint has demonstrated antioxidant and antimicrobial properties in lab studies, but human skin studies are limited.
Common label clues
- Typical concentration
- 1-10% in leave-on products
- Regulatory status
- Generally recognized as safe for cosmetic use. No specific restrictions in the US, EU, or other major markets, but peppermint derivatives should be used at safe concentrations to avoid irritation.
- Common uses
- Serums, Toners, Essences, Moisturizers
- Environmental note
- Peppermint is widely cultivated and generally considered a sustainable crop. The fermentation process uses natural yeast and does not typically involve harsh chemicals.
Good to know
- Fermented ingredients are popular in Korean skincare for their potential to improve skin texture and hydration.
- The 'filtrate' means the liquid is filtered after fermentation, removing solid particles.
Common questions
What is Peppermint Ferment Filtrate in beauty products?
This ingredient is made by fermenting peppermint leaves with a type of yeast called Saccharomyces. Fermentation breaks down the plant material into smaller, potentially more skin-friendly compounds. The result is a liquid that can be added to skincare products to help calm and condition the skin. It's a trendy ingredient in K-beauty and clean beauty, but it's not a powerhouse active — think of it as a supportive, soothing addition rather than a star performer.
What does Peppermint Ferment Filtrate do in a beauty product?
The fermentation process breaks down peppermint leaf components into smaller molecules that may be more easily absorbed by the skin. The resulting filtrate can provide antioxidant and soothing benefits, while the yeast-derived peptides may support skin barrier function. However, the exact mechanisms are not fully established in human studies.
Is Peppermint Ferment Filtrate safe for most people?
This ingredient is considered safe for cosmetic use at typical concentrations. However, individuals with peppermint allergies or very sensitive skin should patch test first. The fermentation process may reduce some irritancy compared to raw peppermint extract, but caution is still warranted.
Who should be careful with Peppermint Ferment Filtrate?
Individuals with known sensitivity or allergy to peppermint or mint family plants
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.