Science
Mechanism of Action
Enterococcus faecalis (notably strain SL-5) deploys bacteriocins to specifically inhibit the growth of Cutibacterium acnes, a key bacterium implicated in acne pathogenesis. Beyond its direct antimicrobial action, its derivatives are formulated to help stabilize skin pH, infuse hydration, mitigate irritation, and lessen inflammation. Further, bacterial lysates naturally provide beneficial components such as hyaluronic acid, vital for moisturization and robust barrier function, and sphingomyelinase, which upregulates ceramide synthesis. Components like lipotechoic acid and peptidoglycan also stimulate the skin's innate immunity and the production of antimicrobial peptides (AMPs).
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 A 4-week clinical trial involving twice-daily application of a lotion containing Enterococcus faecalis SL-5 fermentation extract demonstrated a significant reduction in both pustules and inflammatory lesions, positioning it as a potential alternative to topical antibiotics for acne treatment.
- 02 Another study observed a reduction exceeding 50% in inflammatory lesions after 8 weeks of topical application of an Enterococcus faecalis probiotic lotion, in comparison to a placebo formulation.
Transparency
Dusting Analysis
No data available to suggest this ingredient is commonly 'dusted' in formulations.
The Formula
Formulation
Stability
Formulating with live probiotics is inherently challenging due to viability concerns. Therefore, cosmetic applications predominantly utilize bacterial cell lysates or fermentation extracts of Enterococcus faecalis to ensure both stability and functional efficacy. While the organism optimally proliferates between pH 6.0 and 8.0 and tolerates a wide pH range (2.9 to 11.0), formulations for skin, especially those incorporating ferments or lysates, are optimally designed within a pH range compatible with the skin's natural slightly acidic mantle (e.g., 4.5-5.5) to support microbiome balance.
Conflicts
- Strong preservatives (can inhibit probiotic survival)
- High temperatures (can affect probiotic viability or integrity of derivatives)
Safety
Safety Profile
Official Cosmetic Ingredient Review (CIR) or SCCS evaluations for 'Enterococcus faecalis' as a cosmetic ingredient are not readily available. While it exists as a commensal bacterium, certain virulent strains are recognized as opportunistic pathogens, and antibiotic resistance is a clinical concern. However, in cosmetic applications, stringent selection ensures the use of specific non-pathogenic probiotic strains (e.g., E. faecalis SL-5) or inactivated forms such as lysates or fermentation extracts, prioritizing safety and beneficial outcomes. It's important to note that, in the U.S., cosmetic products making drug-like claims, such as specific acne treatment, are classified as unapproved drugs by the FDA.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Enterococcus faecalis, particularly in its refined derivative forms, presents as a valuable ingredient for precision skincare, demonstrating significant clinical efficacy in mitigating acne and reinforcing skin barrier health through its diverse biological mechanisms.
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References
Sources