Science
Mechanism of Action
The primary mechanism of action involves the extract's abundant phenolic compounds, which function as potent antioxidants. They effectively scavenge free radicals, thereby mitigating oxidative stress that is often implicated in premature skin aging. Additionally, these compounds confer anti-inflammatory and antibacterial activities, promoting a balanced and healthy skin environment.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
No specific data suggests this ingredient is commonly used at sub-efficacious levels; however, direct efficacy data for Corylus Americana Leaf Extract itself is not fully established.
The Formula
Formulation
Stability
Hydroalcoholic extracts are typically employed. Related hazelnut skin extracts have shown stability in oil-in-water emulsions within a dermocompatible pH range of 4.7–5.5. Formulators should note that higher concentrations of some plant extracts may potentially impact product aesthetics such as color and viscosity, with effects observed above 0.2% for related extracts.
Synergies
- UV filters (potential enhancement of UV absorbance)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has determined that available data are insufficient to support the safety of Corylus Americana Leaf Extract in cosmetics. A comprehensive safety assessment requires additional information, including current concentrations of use, detailed extraction and manufacturing processes, contaminant profiles (e.g., pesticides, heavy metals), dermal irritation and sensitization studies, UV absorption properties (and potential photosensitization), 28-day dermal toxicity, reproductive/developmental toxicity, and genotoxicity assays. Although cross-sensitivity to proteins in peanuts and hazelnuts is documented, the presence or absence of proteins in hazelnut leaf extract is currently unknown. Concerns regarding aflatoxins apply primarily to the nuts, not typically the leaves.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While exhibiting promising in vitro properties and benefits observed from a related extract, definitive safety and precise efficacy data for Corylus Americana Leaf Extract in cosmetic formulations remain insufficient, necessitating further research.
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