Science
Mechanism of Action
This ingredient operates by interacting directly with host keratinocytes, promoting skin rejuvenation and strengthening the lipid barrier, while stimulating increased skin cell growth and tissue repair. It selectively inhibits the proliferation of detrimental pathogens such as *Staphylococcus aureus* and *Cutibacterium acnes*, simultaneously enhancing beneficial cellular pathways like collagen and ceramide synthesis. Its anti-inflammatory capabilities are evidenced by the regulation of the cutaneous microbiota and suppression of substance P-mediated inflammatory responses. Furthermore, Hydrolyzed Lactobacillus functions as a DNA repair enzyme, provides antioxidant protection against environmental aggressors, and restores skin barrier integrity by elevating the expression of tight junction proteins (Claudin-1, Occludin) and key epidermal proteins (loricrin, filaggrin). These actions collectively lead to improved skin hydration through decreased transepidermal water loss (TEWL) and increased ceramide levels.
Research
Clinical Evidence
High confidence5%
Key findings
- 01 Demonstrated potent anti-microbial and anti-inflammatory properties, proving effective in acne treatment with faster reduction in lesion size and redness compared to salicylic acid.
- 02 Significantly reduced skin sensitivity in clinical evaluations.
- 03 Achieved a 47% reduction in redness in a targeted 5-person in-vivo study.
- 04 Incorporated into a cream base, it significantly increased the hydration level of the dermis on the hands.
Transparency
Dusting Analysis
Specific effective concentrations are supported by research, indicating clear functional thresholds. There is no evidence suggesting this ingredient is commonly included at ineffective percentages purely for marketing purposes.
The Formula
Formulation
Stability
Lactobacillus strains generally exhibit optimal growth and robust tolerance in acidic environments, with optimal pH values typically ranging from 5.5 to 6.2, and up to 6.5 for L. acidophilus. They maintain good tolerance to conditions within a pH range of 3.7 to 4.3. Formulations incorporating Hydrolyzed Lactobacillus may necessitate precise pH control and co-preservatives to ensure product stability and efficacy.
Safety
Safety Profile
The CIR Expert Panel concluded that related Lactobacillus ferment ingredients are safe for cosmetic application, showing non-irritancy even in undiluted forms. Formulators should be mindful of its potential for skin lightening, which is classified as a drug effect, and ensure usage does not induce skin depigmentation. While the FDA permits harmless lactic acid-producing bacteria in certain foods, this does not directly pertain to its cosmetic safety assessment.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Hydrolyzed Lactobacillus is a highly valuable postbiotic, offering comprehensive benefits for skin health, including robust barrier fortification, microbiome balance, and significant anti-inflammatory and hydrating effects across all skin types.
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