Science
Mechanism of Action
Rhamnolipids interact at a cellular level, engaging with skin surface structures like lipopolysaccharides, phospholipids, and proteins to modify cell characteristics such as hydrophobicity. Their antibacterial efficacy, particularly against Gram-positive bacteria, stems from permeabilizing and weakening bacterial plasma membranes. This ingredient aids in maintaining the skin's optimal acidic pH by facilitating the hydrolysis of triglycerides. Furthermore, its fatty acid component provides moisturization and robust antioxidant activity, protecting against UV-induced free radical damage, while interactions with rhamnose receptors on keratinocytes enhance skin feel and support collagen synthesis.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Demonstrated a significant decrease in mastocyte degranulation in reactive skin, signifying a potent anti-inflammatory effect.
- 02 An observable reduction in mastocyte degranulation, characteristic of reactive skin, was noted.
- 03 Exhibited strong inhibition of Staphylococcus aureus growth, with bactericidal action at pH 5.0 and bacteriostatic effects at pH 6.0.
- 04 Showcased substantial radical scavenging capabilities, confirming its antioxidant properties.
- 05 Typical usage level to provide hydration and anti-inflammatory benefits in serum and lotion formulations.
- 06 Commonly employed for anti-aging and enhanced antioxidant protection in moisturizing creams.
- 07 Standard concentration range for deep yet gentle cleansing action in facial cleansers.
Transparency
Dusting Analysis
Rhamnolipids demonstrate measurable efficacy at concentrations as low as 0.00391% for antimicrobial benefits and 0.1% for anti-inflammatory effects. With typical usage levels for active benefits extending up to 3%, the ingredient shows robust performance across a practical concentration range and is not considered a 'dusted' ingredient, indicating genuine contribution to product function.
The Formula
Formulation
Stability
Rhamnolipids exhibit high stability across a broad pH range of 4.0 to 10.0 and maintain integrity up to 100 °C. While certain historical data suggested potential degradation at elevated temperatures and alkalinity, this was noted not to impact surface activity. Modern understanding confirms robust performance within this wide spectrum. Optimal emulsifying activity often occurs under basic conditions (e.g., pH 8), with maximum overall activity generally observed around pH 6.0-6.5.
Safety
Safety Profile
Rhamnolipids have not been formally reviewed by the Cosmetic Ingredient Review (CIR) Expert Panel, nor has the SCCS published a specific opinion for their cosmetic use. However, the FDA has granted rhamnolipid biosurfactant an exemption from tolerance for residues on food commodities, citing low toxicological concern and no reported adverse effects. This designation, while not a cosmetic approval, strongly implies a favorable toxicological profile and low potential for irritation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Rhamnolipids are a highly valuable, multi-functional ingredient for precision skincare, offering clinically observed anti-inflammatory, antimicrobial, and antioxidant benefits across a wide range of skin types and product applications, supported by a strong safety indication.
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References
Sources