Science
Mechanism of Action
This extract exerts its dermatological benefits through multiple pathways. Its rich polyphenol content, particularly Nordihydroguaiaretic Acid (NDGA), provides robust antioxidant protection by neutralizing free radicals, which helps mitigate oxidative stress and slow cellular aging. It exhibits pronounced anti-inflammatory actions, effectively soothing redness and irritation, and assisting in the management of inflammatory skin conditions like acne. Beyond this, Larrea Mexicana Extract aids in wound healing, prevents the oxidation of sebum to reduce blackhead formation, and possesses senolytic properties that encourage the elimination of aging cells. Furthermore, it demonstrates inherent antibacterial, antiviral, and antifungal activities.
Research
Clinical Evidence
Medium confidence3%
Key findings
- 01 A 3% concentration, formulated in a lotion, demonstrated successful topical treatment for diverse skin conditions including athlete's foot, viral lesions (Herpes Simplex Virus 1 & 2), Kaposi's Sarcoma, and inflammation stemming from contact allergens, ultraviolet light, and thermal exposure.
- 02 In vitro evaluations indicated that a 30% extract generated bacterial growth inhibition halos against a wide range of Gram-negative and Gram-positive bacteria, showing peak activity against S. aureus and S. enterica. Isolated lignans and flavonoids at 12.5-50 µg/mL, and an ethanolic extract at 20 μg/mL (S. aureus) and 30 μg/mL (S. pyogenes), further confirmed antibacterial potential.
- 03 Aqueous extracts at 10% and 20% achieved 100% inhibition against the fungal species Phytophthora capsici and Aspergillus flavus in vitro. Even at 0.1% (1000 ppm), Larrea tridentata leaf extract inhibited Aspergillus flavus growth by 70.06-71.91% at various pH levels.
Transparency
Dusting Analysis
No specific data is available regarding common dusting practices or defined dusting thresholds for Larrea Mexicana Extract in cosmetic formulations.
The Formula
Formulation
Stability
Ethanol-water extracts maintain effective antioxidant properties. To preserve the stability of Nordihydroguaiaretic Acid (NDGA) and prevent its oxidation into a potentially toxic quinone, the incorporation of reducing agents such as ascorbic acid is advised. NDGA's strong chelating properties necessitate avoiding metal utensils during ingredient preparation.
Synergies
- Ascorbic acid (to stabilize NDGA and prevent oxidation)
Conflicts
- Strong taste and smell, which may restrict its use in sensitive product types like lip balms.
- Metals, due to Nordihydroguaiaretic Acid (NDGA)'s chelating properties.
Safety
Safety Profile
While internal consumption of Larrea tridentata and its constituent NDGA has historically been linked to renal and hepatotoxicity, leading to its ban as a food preservative, external application is generally considered safe. However, caution is warranted with prolonged application to deep wounds, which could potentially result in systemic absorption. The Cosmetic Ingredient Review (CIR) Expert Panel has not yet published a specific safety assessment for Larrea mexicana/tridentata extract in cosmetic applications.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Larrea Mexicana Extract presents a valuable, multi-functional asset in precision skincare, offering robust antioxidant, anti-inflammatory, and antimicrobial actions with demonstrated efficacy across a range of skin concerns and excellent skin compatibility.
Related
Similar Ingredients
Finding similar ingredients…
References
Sources