Science
Mechanism of Action
This extract functions through multiple pathways: it delivers antioxidant defense against free radicals and utilizes tannins for broad-spectrum antimicrobial activity, targeting acne-related bacteria such such as Propionibacterium acnes, Proteus vulgaris, Staphylococcus lugdunensis, and Staphylococcus aureus, as well as Candida albicans. Anti-inflammatory compounds soothe irritated skin, while constituents like juglone may offer UV protection by forming a barrier with epidermal proteins. Its astringent tannins contribute to forming a protective coagulation membrane in the skin's uppermost layers, and the extract also supports wound healing, anti-aging effects, skin hydration, and exhibits potential anti-tyrosinase activity for skin brightening.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 All Propionibacterium acnes isolates demonstrated sensitivity to a 10% concentration of Juglans Regia Leaf extract.
- 02 Ethanol extract displayed effectiveness against Staphylococcus lugdunensis and Staphylococcus aureus with Minimum Inhibitory Concentration (MIC) values ranging between 2–4 mg/mL.
- 03 At a non-toxic concentration of 200 µg/mL, the extract resulted in over 40% bacterial mortality within Proteus vulgaris-infected HaCaT cells.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The extract has been successfully incorporated into oil-in-water base creams, maintaining a favorable physicochemical profile and antioxidant effect. It demonstrates stability over time and various storage conditions, also showing photostability within a pH range of 3 to 6.
Conflicts
- Juglone, a constituent, can potentially cause skin staining.
- Potential for photosensitivity may arise due to the presence of juglone.
Safety
Safety Profile
Juglone, a natural component of walnut, can rarely induce skin irritation and hyperpigmentation in humans. Individuals with known nut allergies should exercise caution when using products containing walnut-derived ingredients. Comprehensive toxicological assessments, including skin and eye irritation, genotoxicity, photo-irritation, and dermal absorption studies, are recommended for a complete safety profile.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Juglans Regia Leaf offers a valuable spectrum of benefits for skin health and appearance, particularly for its protective and purifying properties, though careful consideration of its juglone content is advised.
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References
Sources