Science
Mechanism of Action
The blend functions through the synergistic actions of its constituent essential oils. Cinnamon oil (Cinnamomum cassia) contributes antimicrobial effects by disrupting bacterial cell membranes, inhibiting ATPase activity, and preventing biofilm formation, while also acting as an anti-inflammatory agent by suppressing inflammatory markers. Clove essential oil (Syzygium aromaticum) contains eugenol, an active compound effective at inhibiting bacterial growth. Rosemary oil (Rosmarinus officinalis) further enhances the blend's profile with its antioxidant and antimicrobial capabilities. Thyme (Thymus vulgaris) also contributes to the overall antimicrobial and antiseptic characteristics of the blend.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Cinnamomum cassia (50 µg/mL) and Syzygium aromaticum (150 µg/mL) essential oils demonstrated a reduction in Salmonella Typhimurium colonization in an infection model.
- 02 Nanoemulsions containing 3% cinnamon essential oil (Cinnamomum burmannii) and 2% clove essential oil (Syzygium aromaticum) exhibited antibacterial activity against Staphylococcus aureus.
Transparency
Dusting Analysis
No data available to suggest this ingredient is commonly 'dusted' in formulations for marketing purposes.
The Formula
Formulation
Stability
As an essential oil blend, it is primarily oil-soluble and also blends effectively into alcohol-based systems. Cinnamomum cassia bark oil exhibits limited water solubility (2150 mg/L @ 25 °C). Studies on nanoemulsion liquid soaps containing similar essential oils suggest the blend can maintain stability in alkaline conditions, with pH values between 9.73 and 9.86.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) panel deemed this substance safe for use when formulated to be non-sensitizing, however, the European Commission's Scientific Committee on Consumer Safety (SCCS) indicates evidence of contact allergy in humans. This blend carries a high risk of causing allergic skin reactions, general skin irritation, and potentially serious eye damage. Specific concentration limits are critical for its components: Cinnamomum Cassia essential oil is recommended at a maximum topical dilution of 0.05%, Cinnamon Bark at less than 0.1%, and Cinnamon Leaf at 0.6% due to irritancy concerns. Rosmarinus Officinalis Leaf Oil, a component of this blend, contains approximately 15% camphor, a known irritant, making it unsuitable for individuals with sensitive skin. CIR guidelines suggest ≤0.2% for rosemary-derived ingredients in leave-on products. Furthermore, the CIR panel has expressed concerns that this substance may harm reproduction. While the FDA lists Cinnamon Bark Oil as Generally Recognized as Safe (GRAS) as a food additive, this status does not automatically extend to safety for topical cosmetic use, especially for a multi-component essential oil blend with documented topical irritancy and sensitization risks.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Given its high irritancy, high comedogenicity, significant sensitization risk, and potential reproductive harm, this essential oil blend is not recommended for precision skincare formulations despite its antimicrobial and antioxidant properties.
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