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LACTOBACILLUS/ILEX PARAGUARIENSIS LEAF FERMENT FILTRATE.

Valuable / SKIN CONDITIONING

This precision fermented ingredient combines the skin barrier-strengthening, hydrating, and microbiome-supportive benefits of Lactobacillus ferment with the potent antioxidant properties of Yerba Mate leaf extract. Through bio-transformation, its capacity to protect against oxidative stress and calm skin irritation is enhanced, delivering multifaceted conditioning and environmental protection.

Summary

Skin Conditioning Skin Barrier Support Hydration Antioxidant Soothing Microbiome Support Gentle Exfoliation Skin Renewal

Science

Mechanism of Action

This ingredient functions synergistically by leveraging the distinct benefits of its two primary components. The Lactobacillus ferment generates beneficial compounds such as amino acids, peptides, organic acids (including lactic acid), enzymes, and antioxidants. These actively strengthen the skin barrier, provide humectant-driven hydration, maintain a healthy skin pH for gentle exfoliation, and support the skin's natural microbiome. Concurrently, the Ilex Paraguariensis (Yerba Mate) extract contributes a rich profile of polyphenols, flavonoids (like quercetin and rutin), xanthines, and minerals. This botanical fraction acts as a powerful antioxidant, diligently neutralizing free radicals and mitigating oxidative stress, thereby contributing to anti-aging by protecting skin epithelium proteins. The fermentation process itself amplifies the antioxidant activity and overall phytochemical availability from the Yerba Mate, creating a comprehensive ingredient that conditions the skin and forms a protective surface layer.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

While specific efficacy percentages are not detailed, the Lactobacillus ferment component has a reported maximum use concentration of 5.6%. Cosmetic formulators are cautioned against using this ingredient at concentrations that may induce a skin lightening effect, which would classify it as a drug effect. This suggests that effective concentrations are likely below levels that would be considered dusting, and that overuse is a greater concern than underuse for specific regulatory aspects.

The Formula

Formulation

Solubility
Unknown
Optimal pH 4 – 6
0 7 14

Stability

The Ilex Paraguariensis extract component demonstrates stability across a broad pH range of 2 to 7. Within this range, pH 4 to 6 is noted for maintaining optimal color stability. As a ferment filtrate, the live Lactobacillus cells are removed, thus concerns about their viability at lower pH levels (e.g., pH 3.67) are not applicable to the ingredient's stability.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
5.6%
Sensitization risk Unknown

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Lactobacillus Ferment and its related filtrates/lysates safe for cosmetic use, clarifying that the evaluated components are byproducts of fermentation, not live bacteria. The Ilex paraguariensis (Yerba Mate) extract is recognized as Generally Recognized As Safe (GRAS) in the USA. A key formulation consideration is the potential for these ingredients to cause skin lightening; formulators are advised to ensure use does not result in skin depigmentation, which is considered a drug effect.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

LACTOBACILLUS/ILEX PARAGUARIENSIS LEAF FERMENT FILTRATE is a valuable skin conditioning agent, offering comprehensive benefits for barrier support, hydration, and antioxidant protection, with a favorable safety profile.

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