Science
Mechanism of Action
This root extract exerts its effects through steroidal saponins, polysaccharides, and phytosterols. It improves skin's appearance by boosting moisturization, reducing flaking, and restoring suppleness. Its antioxidant properties combat environmental oxidative stress, while anti-inflammatory actions help calm irritated or sensitive skin. Furthermore, components like phytoestrogens may encourage collagen synthesis to enhance elasticity, and potentially regulate sebum production for oily or acne-prone skin.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 No direct clinical studies with effective concentrations were identified for Dioscorea Opposita Root Extract. However, studies on the related species Dioscorea Villosa (Wild Yam) Root Extract showed no significant side effects or metabolic/endocrinal changes with 3-month topical application of a wild yam cream in healthy premenopausal women. Reported use concentrations for Dioscorea Villosa ranged from 0.3% to 15% (0.5% maximum solids) in moisturizing formulations.
Transparency
Dusting Analysis
No data indicates this ingredient is commonly associated with dusting or requires a specific dusting analysis.
The Formula
Formulation
Stability
Yam soluble proteins from Dioscorea opposita exhibit high solubility in distilled water across a broad pH range, with minimal solubility around pH 3. Optimal antioxidant activity has been observed at pH 5.0. General yam extracts are typically prepared using water or alcohol.
Conflicts
- High salt concentrations (e.g., 0.5 M and 1.0 M NaCl) may reduce the solubility of protein components from Dioscorea opposita.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has not specifically reviewed Dioscorea Opposita Root Extract under this INCI name. Their 'safe as used' conclusion applies to Dioscorea Villosa (Wild Yam) Root Extract, with validity for extracts exhibiting a similar chemical profile and diosgenin content (up to 3.5%). Maximum reported use concentrations for Dioscorea Villosa were up to 15% (0.5% max solids) in 1999 and 0.3% in non-spray moisturizing products in 2022. No specific SCCS or FDA regulatory status, beyond general cosmetic use for Dioscorea Villosa, has been identified.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Dioscorea Opposita Root offers broad conditioning, antioxidant, and potential anti-aging benefits, making it an optional addition to formulations, though specific clinical efficacy for this INCI requires further investigation.
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References
Sources