Science
Mechanism of Action
This extract operates through multiple pathways to improve skin vitality. It is rich in antioxidants, effectively neutralizing free radicals to mitigate signs of aging. It stimulates collagen synthesis, contributing to strengthened skin structure and maintained elasticity. The extract also enhances skin moisture and refines texture. Its anti-inflammatory capabilities are evidenced by the inhibition of inflammatory cytokines such as monocyte chemoattractant protein-1, VCAM-1, ICAM-1, IP-10, I-TAC, and MIG, alongside the suppression of TNF-α release and gene expression, which benefits compromised skin. Furthermore, it promotes blood microcirculation, improving skin tone, and offers natural antibacterial and antifungal actions, making it valuable for managing acne and preventing microbial proliferation. The primary active component, cinnamaldehyde, is a key contributor to its antioxidant and antimicrobial efficacy. The ingredient is also considered non-comedogenic.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Demonstrated significant anti-inflammatory and anti-proliferative activity in human dermal fibroblasts by inhibiting inflammatory cytokines (e.g., monocyte chemoattractant protein-1, interferon gamma-induced protein 10) and tissue remodeling molecules (e.g., epidermal growth factor receptor, matrix metalloproteinase 1). This concentration was found to be non-cytotoxic.
- 02 Exhibited potent anti-inflammatory activity by suppressing intracellular TNF-α release in murine neutrophils and leukocytes, and inhibiting TNF-α gene expression in LPS-stimulated human PBMCs.
- 03 Identified as a typical use level for its antioxidant capabilities, skin-soothing effects, and antimicrobial properties in cosmetic formulations.
Transparency
Dusting Analysis
While Cinnamomum Zeylanicum Bark Extract demonstrates beneficial effects at concentrations up to 5%, its naturally occurring cinnamaldehyde component is a potent allergen. Regulatory bodies like IFRA recommend limiting cinnamaldehyde to 0.1% in the finished cosmetic product to mitigate sensitization and irritation risks. Consequently, using the bark extract at higher percentages (e.g., 0.5-5%) without precise analytical control over its cinnamaldehyde content can easily exceed this critical threshold, leading to potential adverse reactions. This necessitates careful formulation and raw material assessment to avoid 'dusting' by incorporating the extract at levels that provide benefit but compromise safety due to its allergenic constituents.
The Formula
Formulation
Stability
Related Cinnamomum extracts have shown good stability in water-in-oil (W/O) cream formulations within a pH range of 5.9 to 6.36, provided temperatures are maintained below 25°C. Lower pH values may negatively impact the polysaccharides within microencapsulated extracts, potentially altering permeability and encapsulation efficiency.
Conflicts
- High concentrations, particularly due to the presence of volatile fragrance compounds such as cinnamaldehyde and eugenol, which significantly increase the likelihood of skin irritation or allergic reactions.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has not specifically reviewed Cinnamomum Zeylanicum Bark Extract. However, the European Commission's Scientific Committee on Consumer Safety (SCCS) identifies this substance as an established contact allergen in humans. The U.S. FDA lists 'Cinnamon Bark, Oil (Cinnamomum Spp.)' as 'Generally Recognized As Safe' (GRAS) for food flavoring. Despite some general safety allowances in food, topical cosmetic use is complicated by compounds like cinnamaldehyde and eugenol, which are natural constituents of the extract. These compounds can induce skin irritation or allergic reactions, especially in sensitive individuals or at elevated concentrations. Patch testing is strongly recommended. The International Fragrance Association (IFRA) advises that the concentration of cinnamaldehyde, a primary allergen, should not exceed 0.1% in the final cosmetic product to mitigate sensitization concerns.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its demonstrable antioxidant, anti-inflammatory, and antimicrobial benefits at low concentrations, the significant risk of skin irritation and sensitization, primarily due to its cinnamaldehyde content exceeding the 0.1% safety threshold, makes Cinnamomum Zeylanicum Bark Extract a questionable ingredient for general cosmetic application, particularly for sensitive skin types.
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