Science
Mechanism of Action
This extract, along with related Prunus species, exerts its multifunctional effects through its high concentration of phenolic compounds, flavonoids like rutin, and condensed tannins. It provides robust antioxidant protection by neutralizing free radicals, chelating metal ions, and inhibiting oxidative enzymes, thereby mitigating environmental damage and cellular stress. Its anti-inflammatory action is mediated by modulating key inflammatory mediators such as nitric oxide, interleukin-6, and tumor necrosis factor-alpha, which effectively reduces redness and irritation. Furthermore, it demonstrates anti-tyrosinase activity, suppressing melanin synthesis and tyrosinase-related protein expression to promote a more even skin tone. Other documented benefits include stimulating collagen production, reinforcing the skin barrier, enhancing elasticity, diminishing fine lines, and supporting wound healing through improved re-epithelialization and neovascularization. It may also offer auxiliary UVB photoprotection by elevating SPF values.
Research
Clinical Evidence
Medium confidence3%
Key findings
- 01 Demonstrated anti-inflammatory effects in 40 volunteers, leading to significantly lower visual scores for irritation and reduced erythema compared to placebo.
- 02 Showed dose-dependent antioxidant and anti-apoptotic effects against UVB radiation, evidenced by reductions in reactive oxygen species (ROS) and malondialdehyde (MDA), and increased antioxidant enzyme activities.
- 03 Evaluated for dermal safety on 26 healthy volunteers, confirming no signs of irritation and suitability for human skin.
Transparency
Dusting Analysis
No data in the research suggests this ingredient is commonly 'dusted' or used at ineffective low concentrations for marketing purposes. Efficacy is observed at clinically relevant percentages.
The Formula
Formulation
Stability
Prunus leaf extracts are susceptible to degradation, particularly at elevated temperatures (e.g., 45°C), which can significantly diminish phenolic and tannin content, as well as antioxidant activity. Optimal stability is achieved under refrigeration (4°C), preserving 70-80% of initial phenolic content over 60 days. Anthocyanins, a key component, remain stable within pH 3.0-6.0 and temperatures up to 70°C. General protective measures against light and oxygen are recommended to maintain ingredient integrity.
Safety
Safety Profile
While a specific Cosmetic Ingredient Review (CIR) status for PRUNUS SUBHIRTELLA ASCENDENS LEAF EXTRACT is not yet available, studies on closely related Prunus leaf extracts (e.g., Prunus yedoensis, Prunus cerasifera) have consistently demonstrated dermal safety. These related extracts exhibited no irritation in human patch tests at concentrations up to 3% in formulations and were non-cytotoxic in in vitro cell studies at concentrations up to 2.0%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PRUNUS SUBHIRTELLA ASCENDENS LEAF EXTRACT is a valuable botanical ingredient, offering comprehensive benefits including potent antioxidant, anti-inflammatory, and brightening effects, suitable for nearly all skin types with a low risk of irritation.
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References
Sources