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DIOSCOREA OPPOSITA ROOT EXTRACT.

Valuable / SKIN CONDITIONING

Dioscorea Opposita Root Extract, derived from wild yam, is a multi-functional botanical extract prized for its comprehensive skin benefits. It actively supports skin structure by stimulating collagen, offers powerful antioxidant protection, and enhances skin hydration, contributing to a more youthful and resilient complexion.

Skin conditioning Antioxidant Moisturizing Anti-inflammatory Skin soothing Collagen boosting Elasticity enhancing Skin regeneration Hyperpigmentation reduction Skin barrier support Sebum regulation

Science

This extract contributes to skin health through several key actions. It stimulates collagen synthesis, fortifying the skin's structural integrity and minimizing the appearance of fine lines. As a potent antioxidant, it neutralizes free radicals from environmental aggressors like pollution and UV radiation, thus guarding against premature aging, wrinkles, and hyperpigmentation. Its moisturizing properties aid in moisture retention, promoting a smooth, soft, and supple skin texture while alleviating dryness. The extract also possesses anti-inflammatory and soothing capabilities, effectively reducing irritation, redness, and swelling, which can benefit conditions such as acne, rosacea, and eczema. Rich in vitamin C and other bioactive compounds, it fosters skin regeneration. The presence of phytoestrogens may mimic estrogen's beneficial effects, which can decline with age, potentially boosting collagen production, improving elasticity, and increasing skin thickness and firmness. Furthermore, it inhibits melanin overproduction, helping to even out skin tone and diminish hyperpigmentation, age spots, and post-acne marks. It strengthens the skin's natural protective barrier, enhancing its resistance to external factors and reducing transepidermal water loss (TEWL). Its potential hormonal balancing properties may also assist in regulating sebum production, benefiting oily and acne-prone skin types.


Research

Low confidence
Effective range 0.3–15%
Optimal

N/A

Key findings

  1. 01 A clinical study reported no significant side-effects or metabolic/endocrinal changes with the 3-month topical application of wild yam cream in healthy premenopausal women, though specific effective concentrations were not provided.

Transparency

Not commonly dusted

No information suggests this ingredient is commonly 'dusted' in formulations.


The Formula

Solubility
Water
Optimal pH 4 – 6.8
0 7 14

Stability

The extract is stable within a pH range of 4.0 to 6.8. Its safety is contingent on the preparation method, specifically ensuring diosgenin content does not exceed 3.5% to prevent potential hormonal activity. While some formulations showed minor color deepening and viscosity increase post-stability testing, pH remained stable. It can be prepared using water/alcohol extraction and diluted in various solvents including glycols, glycerin, water, or vegetable oil.


Safety

CIR Status
Safe as used
Max tested
15%
Sensitization risk Low

The CIR Expert Panel considers Dioscorea Villosa (often used interchangeably with Dioscorea Opposita) and similar extracts safe for cosmetic use, provided the diosgenin content is kept below 3.5% to avoid hormonal effects. Undiluted extract may cause mild irritation to intact or abraded skin and eyes, but dilutions of 10% or less are generally non-irritating. A 25% dilution did not induce sensitization. Rare instances of allergic reactions, such as rashes or itching, may occur in highly sensitive individuals, warranting a patch test.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

Dioscorea Opposita Root Extract is a valuable, well-tolerated ingredient offering broad benefits from anti-aging and hydration to skin soothing and tone evening, suitable for most skin types when formulated within established safety parameters.


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