Common Name(s): R-escherichia coli ferment
DESCRIPTION
What It Does: Delivers postbiotic skin-conditioning metabolites, antioxidant protection, and microbiome-balancing activity through fermentation-derived bioactives.
Why It's Used: Fermentation biotransforms parent substrates into smaller, more bioavailable molecular fractions with enhanced skin activity and postbiotic microbiome benefits.
How It Works: Fermentation-derived metabolites (organic acids, enzymes, peptides, and bioactive polyphenols) interact with skin surface receptors, modulate the microbiome, and penetrate the stratum corneum to condition and protect skin cells.
Typically Found In: Serums,toners,essences,k-beauty formulations,microbiome skincare
TECHNICAL DETAILS
Primary Category: Fermented ingredients
Secondary Functions: Antioxidant,skin-conditioning,brightening
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.5โ10%
SOURCING & ETHICS
Vegan Status: Yes
Halal Status: Yes
Source Notes: Produced by fermentation process; no animal components unless substrate is animal-derived.
SKIN COMPATIBILITY
Irritancy Rating: 1
Comedogenicity Rating: 0
Sensitivity Concerns: Low sensitization potential at recommended use concentrations.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Well-characterized cosmetic ingredient with established safety profile. generally non-irritating at typical use concentrations. suitable for leave-on and rinse-off cosmetics.
Works Well With: Niacinamide,hyaluronic acid,ceramides,vitamin c,probiotics
Avoid Combining With: Strong oxidizers; extreme ph
SCIENTIFIC NOTE
Fermentation typically reduces molecular weight of substrate polysaccharides and proteins through enzymatic hydrolysis, increasing skin penetration. postbiotic metabolites (short-chain fatty acids, bacteriocins, organic acids) modulate tlr receptor signaling in keratinocytes, influencing barrier gene expression (filaggrin, loricrin) and immune tone without live microorganism exposure.
Last Verified: Cosing eu database; pcpc cosmetic ingredient safety reviews; postbiotic cosmetic ingredient literature; fermentation biotechnology reviews
Primary Sources: 2025-01-15