Ingredient review
Streptomyces Subrutilus Ferment Filtrate
INCI: STREPTOMYCES SUBRUTILUS FERMENT FILTRATE EXTRACT
A gentle, biotech-derived ingredient that may help hydrate and support the skin barrier, but research is still early.
In plain English
This ingredient is made by fermenting a type of bacteria called Streptomyces subrutilus. The resulting liquid is filtered and used in skincare. It's thought to help keep skin hydrated and support the skin's natural barrier, which is the outer layer that protects against moisture loss and irritants. Think of it as a gentle, science-made helper for your skin's moisture defense system.
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
Streptomyces Subrutilus 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 Streptomyces Subrutilus 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 from the fermentation of Streptomyces subrutilus bacteria, containing peptides, amino acids, and other bioactive compounds.
How it works
In a cosmetic product, it is believed to work by providing humectant properties (attracting water to the skin) and potentially supporting the skin's natural barrier function through its peptide and amino acid content.
Pros
Gentle hydration
Provides moisture without common irritation, making it suitable for sensitive skin types.
Barrier support potential
May help strengthen the skin's natural barrier, reducing moisture loss over time.
Cons and cautions
Limited research
Most evidence comes from lab studies or small trials; large-scale human studies are lacking.
Batch variability
As a fermentation product, the exact composition can vary between batches, potentially affecting consistency.
Best for
- Those with dry or dehydrated skin
- Anyone looking for a gentle, biotech-based hydrating ingredient
Use caution if
- Individuals with known allergies to bacterial ferment filtrates (rare)
Usage tips
Safety summary
Considered safe for topical use with a low risk of irritation. No significant safety concerns have been reported in cosmetic concentrations.
Research notes
Emerging evidence suggests potential hydrating and barrier-supporting benefits, but more rigorous human studies are needed to confirm efficacy.
Common label clues
- Typical concentration
- Typically 0.5% to 5% in leave-on products
- Regulatory status
- Generally recognized as safe for cosmetic use in the US and EU, subject to standard cosmetic regulations.
- Common uses
- Serums, Moisturizers, Essences
- Environmental note
- Fermentation-based production is generally considered more sustainable than petrochemical-derived ingredients, but specific sourcing varies by manufacturer.
Good to know
- This ingredient is often found in Korean and Japanese skincare products.
- It is not a live bacteria; the fermentation process is filtered, so it is shelf-stable.
Common questions
What is Streptomyces Subrutilus Ferment Filtrate in beauty products?
This ingredient is made by fermenting a type of bacteria called Streptomyces subrutilus. The resulting liquid is filtered and used in skincare. It's thought to help keep skin hydrated and support the skin's natural barrier, which is the outer layer that protects against moisture loss and irritants. Think of it as a gentle, science-made helper for your skin's moisture defense system.
What does Streptomyces Subrutilus Ferment Filtrate do in a beauty product?
In a cosmetic product, it is believed to work by providing humectant properties (attracting water to the skin) and potentially supporting the skin's natural barrier function through its peptide and amino acid content.
Is Streptomyces Subrutilus Ferment Filtrate safe for most people?
Considered safe for topical use with a low risk of irritation. No significant safety concerns have been reported in cosmetic concentrations.
Who should be careful with Streptomyces Subrutilus Ferment Filtrate?
Individuals with known allergies to bacterial ferment filtrates (rare)
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.