Science
Mechanism of Action
Thuja occidentalis extracts function by combating oxidative stress and DNA damage through their antioxidant activity. They exert anti-inflammatory effects by modulating inflammatory mediators such as histamine, serotonin, PGE2, and bradykinin, which helps reduce vascular permeability and neutrophil migration. Specific fractions have been shown to decrease pro-inflammatory cytokines (TNF-α, IL-6), inhibit COX-2 and iNOS activity, and lessen overall oxidative stress. This action profile suggests potential support for skin regeneration, wound healing, and restoration of skin elasticity and firmness.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Topical preparations of Thuja occidentalis herb top dry extracts are utilized to address warts and fungal infections. For a 4:1 w/w dry extract, concentrations of 2.5% to 5% are relevant in finished products.
- 02 Topical preparations of Thuja occidentalis herb top liquid extracts (e.g., tinctures) are also employed for warts and fungal infections. For a 1:5 w/v tincture, a minimum finished product concentration of 50% is suggested.
- 03 In an in vitro study, a Thujone-Rich Fraction (TRF) from Thuja occidentalis demonstrated cytotoxic effects on A375 skin cancer cells at concentrations of 100-200 μg mL⁻¹.
Transparency
Dusting Analysis
Thuja occidentalis extracts, particularly herb top preparations, are typically used at substantial concentrations (e.g., 2.5-5% for dry extracts, up to 50% or more for liquid tinctures) when targeting specific conditions like warts and fungal infections. This indicates a requirement for higher active concentrations, making it less likely to be 'dusted' at sub-efficacious levels for marketing claims.
The Formula
Formulation
Stability
Specific stability data for the root extract is not provided in the available research.
Conflicts
- General Thuja extract warnings advise against use on sensitive areas such as the face or genital region.
- Potential for interactions due to thujone content if significant absorption occurs; however, this is primarily a concern for internal use.
Safety
Safety Profile
Information specifically on 'Thuja occidentalis root extract' safety is limited. Broader safety assessments for general Thuja occidentalis extracts or extracts from other plant parts (like leaf or herb top) suggest caution. The plant contains thujone, which is potentially toxic and can cause neurological issues in large oral doses. Oral use is 'LIKELY UNSAFE' during pregnancy and breastfeeding and may worsen autoimmune conditions. For topical applications, general Thuja extracts have been noted to lack sufficient reliable information regarding safety and side effects. Health Canada advises 'For external use only. Do not use on the face or genital area. If contact occurs, rinse thoroughly with water' for topical 'Thuja occidentalis Herb top'. 'Thuja Occidentalis Leaf Extract' is regulated and subject to SCCS restrictions in cosmetic products. Due to these concerns and lack of specific root extract data, its use requires careful consideration, especially for sensitive skin or internal exposure. The maximum concentrations provided (0.5-10% for dry extract; 10-100% for liquid extract) pertain to Thuja occidentalis herb top preparations, not specifically the root extract.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While Thuja occidentalis extracts demonstrate promising antioxidant and anti-inflammatory properties, specific data for the 'root extract' is insufficient, and general plant safety concerns warrant a cautious approach in precision skincare formulations.
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References
Sources