Science
Mechanism of Action
The extract's mechanism of action involves its diverse array of bioactive constituents. Lawsone, a prominent active compound, is known for its ability to interact with keratin. Overall, the extract exhibits potent antioxidant effects by neutralizing free radicals, anti-inflammatory capabilities to soothe the skin, and antimicrobial properties that support a healthy skin barrier. It also contributes to wound healing processes.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 A Repeated Insult Patch Test (RIPT) on human volunteers showed no irritant or sensitizing potential when applied topically at 10% concentration in petrolatum.
- 02 Ethanolic leaf extracts demonstrated anti-inflammatory activity in animal models with oral concentrations of 0.25-2.0 g/kg.
- 03 A methanolic extract of henna seeds exhibited anti-inflammatory capabilities in vitro with an IC50 of 510.23 mg/L.
Transparency
Dusting Analysis
No specific dusting threshold or red flag percentage for efficacy is explicitly defined in the available research data. Recommended use concentrations in skin and hair care products are generally within the 5-10% range.
The Formula
Formulation
Stability
The extract maintains antifungal activity and stability optimally between pH 7 and 9, with reduced efficacy observed at pH 4. Active compounds in acetone extract are light-stable and resistant to photo-oxidation. The extract and bio-formulations demonstrated good stability over 6 to 12 months of storage. Efficacy was preserved with wet heat up to 50°C and dry heat up to 40°C; however, prolonged exposure to higher temperatures (100°C wet, 90°C dry) could diminish antifungal potential.
Safety
Safety Profile
While a human Repeated Insult Patch Test (RIPT) at 10% concentration showed no irritant or sensitizing potential for the extract, rare instances of contact allergies have been documented. The primary active component, lawsone (present at 1-2% in dried leaves), has demonstrated genotoxic and mutagenic potential in both in vitro and in vivo studies, leading the SCCS to state that no safe threshold can be established for lawsone itself. However, the extract at low cosmetic concentrations is not generally considered to pose an unreasonable risk. High ethanolic concentrations (80%) of Lawsonia inermis *root extract* were associated with adverse reproductive and developmental effects in animal studies; this is a cautionary note, though not directly applicable to the flower/fruit/leaf extract at typical cosmetic concentrations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Lawsonia Inermis Flower/Fruit/Leaf Extract is a valuable botanical offering antioxidant, anti-inflammatory, and antimicrobial benefits with a demonstrated low irritancy profile in human topical tests, making it suitable for targeted skincare formulations despite specific efficacy concentration data limitations.
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References
Sources