Science
Mechanism of Action
This extract combats skin aging by acting as a potent agonist for collagen production and increasing the epidermis's thickness, which collectively minimizes the appearance of wrinkles and sagginess. It also stimulates lipogenesis, thereby enhancing the skin's natural lipid content, which helps prevent subcutaneous fat loss and contributes to a smoother skin appearance. Rich in phytochemicals such as flavonoids, tannins, alkaloids, and volatile compounds, it also provides antioxidant and anti-inflammatory properties. In high concentrations, it has demonstrated inhibitory effects against certain bacteria, though this is less relevant for typical cosmetic applications.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Demonstrated potent agonistic activity in stimulating collagen production and epidermis thickening, providing anti-aging benefits. Also shown to stimulate lipid production (lipogenesis) to prevent subcutaneous fat loss and enhance skin appearance.
- 02 Exhibited inhibitory effects against Staphylococcus aureus and Pseudomonas aeruginosa. Note: These are very high concentrations, not typically representative of skin benefits in cosmetic formulations.
Transparency
Dusting Analysis
A patent indicates efficacy for cosmetic benefits starting at concentrations as low as 0.0001%. While effective across a broad range up to 90%, the extremely low minimum effective dose makes it susceptible to 'dusting' where brands might include it below 0.0001% for marketing claims, potentially rendering it ineffective for the primary anti-aging benefits.
The Formula
Formulation
Stability
The extract can be prepared using a wide array of solvents, including water, alcohols, glycols, ethers, esters, and ketones, suggesting versatility in formulation and stability across diverse solvent systems. Specific pH stability within a finished cosmetic product is not detailed.
Safety
Safety Profile
Hoya Carnosa Leaf Extract has not undergone a specific safety assessment by the Cosmetic Ingredient Review (CIR) or the Scientific Committee on Consumer Safety (SCCS). It is regulated as a cosmetic ingredient under the US FD&C Act. General toxicological reviews of Hoya species extracts suggest low toxicity, with LD50 values typically exceeding 2000 mg/kg bw, indicating it is likely non-toxic in this context.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Hoya Carnosa Leaf Extract is a valuable, multi-functional ingredient demonstrating significant potential for anti-aging through collagen and lipid stimulation, complemented by antioxidant and soothing properties, suitable for all skin types with low irritancy and comedogenicity.
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