Science
Mechanism of Action
The extract contains a rich profile of bioactive compounds, including lawsone (its primary dye molecule), flavonoids, phenolic compounds, tannins, saponins, coumarins, and terpenoids. Lawsone is known to interact with keratin in skin, hair, and nails. Its antioxidant activity is largely attributed to the presence of phenolic compounds and flavonoids, while other constituents contribute to its observed antimicrobial, anti-inflammatory, and wound-healing benefits.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Scientific Committee on Consumer Safety (SCCS) of the European Commission has concluded that lawsone exhibits genotoxicity/mutagenicity both in vitro and in vivo. Consequently, no safe threshold for lawsone can be established. While the extract is typically used at low concentrations in cosmetic products, the inherent genotoxicity of its key active component presents a significant concern for precision skincare.
The Formula
Formulation
Stability
Antifungal activity remains stable between pH 7 and 9, but is diminished at pH 4, indicating optimal activity in neutral to alkaline conditions. The lawsone content in dry extracts can maintain stability (less than 10% decrease) for at least one month at room temperature (60% relative humidity, protected from light), provided it contains 7-60% lawsone from glycosylated derivatives.
Safety
Safety Profile
The European Commission's SCCS has identified genotoxicity/mutagenicity potential for lawsone, the main active component, and concluded that no safe threshold can be established. Despite this, cosmetic use at low concentrations is generally not expected to lead to systemic toxicity. A repeated insult patch test with 10% henna in petrolatum on 10 human volunteers showed no irritant or sensitizing potential, though SCCS deems such studies unethical for substances with genotoxic concerns. Contact allergies are rare, with only two case reports documented in literature.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its potential antioxidant, antimicrobial, and wound-healing properties, the significant genotoxicity concerns and the SCCS conclusion of 'no safe threshold' for lawsone make this ingredient unsuitable for precision skincare formulations.
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