Science
Mechanism of Action
This dual-action ferment filtrate primarily functions as a potent antioxidant, neutralizing free radicals to prevent oxidative stress and ingredient degradation. The Lactobacillus ferment component broadly supports skin health by contributing to enhanced hydration, strengthening the skin's natural barrier, providing anti-inflammatory benefits, and fostering a balanced skin microbiome. It may also stimulate the skin's innate defense peptides, such as beta-defensins. Concurrently, the Smilax China leaf extracts are recognized for their notable anti-inflammatory and antimicrobial properties, particularly effective against *Cutibacterium acnes*, a bacterium associated with acne. Furthermore, Smilax china promotes skin healing and barrier repair by accelerating keratinocyte migration and proliferation, stimulating collagen synthesis, and upregulating crucial barrier proteins.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The available research does not suggest that this ingredient is commonly used as a filler or at concentrations indicative of dusting.
The Formula
Formulation
Stability
While an explicit optimal pH range for the stability of the ingredient in a final formulation was not identified, typical Lactobacillus fermentation processes begin at pH 6.0-6.2 and conclude at pH 4.0-4.2. A formulated postbiotic cream containing a similar Lactobacillus ferment lysate was found to be stable and safe for skin at a pH of 6.00 ± 0.02. This ingredient is considered a postbiotic, with live bacterial cultures removed through filtration during preparation. No specific formulation incompatibilities were reported in the available data.
Safety
Safety Profile
The CIR Expert Panel, in June 2025, concluded that a broader category of Lactobacillus ferment ingredients, including Lactobacillus Ferment Filtrate, are safe for use in cosmetics. This assessment is based on these ingredients primarily being byproducts of fermentation (e.g., metabolites, enzymes, peptides, organic acids, fragments of dead bacteria), not live microorganisms. However, the specific composition of these byproducts in cosmetic applications often lacks detailed data. No specific SCCS or FDA regulatory status was found for this precise combination: LACTOBACILLUS/SMILAX CHINA LEAF FERMENT FILTRATE. Sensitization risk and irritancy remain unquantified for this specific combined ingredient.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This versatile ingredient provides significant antioxidant protection, reinforces skin barrier function, and offers soothing and anti-inflammatory benefits, making it valuable for a wide range of skin types.
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References
Sources