Science
Mechanism of Action
This extract functions as a powerful antioxidant, effectively neutralizing free radicals to shield the skin from environmental damage and mitigate signs of aging, attributed to its abundance of flavonoids and tannins. It delivers soothing and anti-inflammatory benefits, making it particularly beneficial for sensitive or reddened complexions. Furthermore, it aids in balancing sebum production and reducing pore visibility, catering to oily and combination skin types. Its antibacterial qualities can help address skin imperfections, while its regenerative properties support skin restoration. Some research, primarily on fruit extracts, indicates a potential to inhibit melanin production by suppressing tyrosinase activity.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 A cosmetic cleanser containing a blend, including Diospyros Kaki folium, was observed to reduce skin oil content and pore size in human participants, though the specific concentration of the isolated leaf extract was not quantified.
- 02 An in vitro study demonstrated that a Diospyros kaki fruit extract (at 0.5 mg/ml) diminished oxidative stress-induced decline in mouse myoblast cell viability by inhibiting intracellular reactive oxygen species (ROS) production.
- 03 Oral administration of a calyx extract from Diospyros kaki effectively decreased atopic dermatitis-like lesions in a mouse model through pro-inflammatory cytokine inhibition; however, this involved a different plant part and route of administration than topical leaf extract.
Transparency
Dusting Analysis
No data available in the provided research to suggest Diospyros Kaki Leaf Extract is commonly dusted or to establish a dusting threshold.
The Formula
Formulation
Stability
This extract is susceptible to degradation from light and heat. To maintain its integrity, formulations should be housed in light- and air-proof packaging and stored in cool, dark conditions.
Conflicts
- The tannins present in persimmon leaf extracts can interact with and potentially denature proteins.
- Caution is recommended when combining with other active ingredients, as potential itching or irritation may occur.
Safety
Safety Profile
Generally regarded as safe for cosmetic applications, with international regulations permitting its use. However, individuals with sensitive skin should conduct a patch test, as allergic reactions or irritations have been reported in rare instances. The EWG Skin Deep® database classifies it as 'Restricted' for EWG VERIFIED™ products without adequate substantiation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Diospyros Kaki Leaf Extract is a valuable botanical ingredient offering robust antioxidant, anti-inflammatory, and sebum-regulating properties, making it suitable for a broad spectrum of skin types, though specific topical human efficacy concentrations require further isolated investigation.
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References
Sources