Science
Mechanism of Action
This extract is rich in potent antioxidants, including flavonoids and essential oils, which actively neutralize free radicals, thereby mitigating signs of premature skin aging. Its anti-inflammatory action is evidenced by the downregulation of inflammatory markers such as IL-6, TNF-α, and COX-2, leading to reduced redness and irritation. Furthermore, it exhibits broad-spectrum antimicrobial efficacy against various bacteria (gram-positive and negative), fungi, and viruses, making it beneficial for problematic skin. It also supports skin hydration, enhances tone, and contributes to natural cellular regeneration, improving elasticity and firmness. The extract provides protective benefits against oxidative stress and DNA damage, with promising indications for wound healing and inhibition of tissue remodeling proteins.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 An in vitro study indicated that Arborvitae (Thuja plicata) essential oil, at its highest non-cytotoxic concentration (0.011%), significantly inhibited key proteins and genes associated with inflammation and tissue remodeling in human dermal fibroblasts. While promising, this finding pertains specifically to the essential oil, not the leaf extract.
- 02 A generic Thuja leaf oleoresin demonstrated antibacterial activity, with minimum inhibitory concentrations (MICs) of 12.5 µl against Pseudomonas aeruginosa and Streptococcus spp., and 25 µl against E. coli and Staphylococcus aureus. This data provides insight into Thuja's antimicrobial potential but is not specific to Thuja plicata leaf extract by percentage.
Transparency
Dusting Analysis
No data suggests that Thuja Plicata Leaf Extract is commonly 'dusted' or used at concentrations significantly below its effective range for marketing purposes.
The Formula
Formulation
Stability
Specific pH range for optimal stability is not documented. As a botanical extract containing various compounds, its stability may be influenced by light, air, and temperature.
Conflicts
- Components akin to the essential oil within the extract may be immiscible in predominantly aqueous formulations, potentially necessitating the use of solubilizers (e.g., Tween 80) to achieve stable emulsions.
Safety
Safety Profile
No specific safety assessments by CIR, SCCS, or FDA were found for Thuja Plicata Leaf Extract. Thuja species, particularly their essential oils, are known to contain thujone, a compound that can be toxic in high or prolonged doses. Thuja plicata essential oil, for instance, has been reported to contain 52.1%-59.2% α-thujone. The thujone content in a 'leaf extract' can vary significantly depending on the extraction method and concentration, making careful formulation and dosage critical to ensure safety. While INCI Beauty indicates 'no penalty' for the extract, the potential for thujone requires vigilance.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Thuja Plicata Leaf Extract is a versatile botanical ingredient offering a broad spectrum of benefits including antioxidant, anti-inflammatory, and antimicrobial activity across all skin types, though precise effective concentrations and careful consideration of thujone content in extracts are crucial for optimal and safe formulation.
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