Science
Mechanism of Action
This extract fortifies the skin's natural protective barrier, enhancing moisture retention and promoting a smoother, softer texture. Its active compounds stimulate collagen synthesis, crucial for improving skin structure, diminishing the appearance of fine lines, and restoring firmness. Additionally, it provides anti-inflammatory and soothing effects, while its abundant vitamin C and other antioxidants aid in skin regeneration and protection against environmental aggressors. Key constituents, such as diosgenin (a phytoestrogen), may help regulate sebum production to mitigate hormonal acne.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Diosgenin, derived from Dioscorea composita or Dioscorea villosa, effectively countered skin aging in an in vitro human 3D skin model by boosting intracellular cAMP levels, bromodeoxyuridine absorption, and DNA synthesis in adult human keratinocytes, suggesting enhanced keratinocyte proliferation and repair.
- 02 Historically, Dioscorea Villosa Root Extract has been used in moisturizing formulations at concentrations up to 15% (equivalent to 0.5% plant solids). More recent data from 2022 indicates its use at 0.3% in non-spray moisturizing products.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The safety and efficacy of Dioscorea root extracts are contingent on the preparation method, particularly concerning diosgenin content, with an upper limit of 3.5% diosgenin being a factor for the 'safe as used' conclusion by CIR for related species. The extract demonstrates versatility in formulation, being dilutable in common cosmetic solvents such as propylene glycol, butylene glycol, glycerin, water, or alcohol. Optimal pH for stability and efficacy is noted to be within the range of 4.0 to 6.8.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deemed Dioscorea Villosa (Wild Yam) Root Extract, a closely related species, safe for use in cosmetic formulations. This safety conclusion extends to extracts with a similar chemical profile, specifically those containing an upper limit of 3.5% diosgenin. The FDA notes its use in body and hand preparations, with industry reports confirming its presence across diverse cosmetic categories. A 10% dilution has been shown to be non-irritating to intact rabbit skin.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Dioscorea Composita Root Extract is a valuable ingredient, offering broad benefits for skin health, including anti-aging, barrier support, and soothing properties, with excellent compatibility across all skin types.
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