Science
Mechanism of Action
This extract operates through multiple biological pathways to support skin health. Its robust antioxidant activity stems from a rich profile of polyphenolic compounds, including rosmarinic acid, chlorogenic acid, and various flavonoids. Anti-inflammatory effects are achieved by inhibiting the STAT-3 transcription factor, a key mediator in inflammatory skin disorders, and by acting as an agonist on the cannabinoid receptor type 2 (CB2), promoting epidermal homeostasis and reducing inflammation and pain perception. It further reduces pro-inflammatory cytokines such as TNF-α and nitric oxide synthesis. For depigmentation, the extract directly inhibits melanin synthesis and curtails the secretion of melanogenic paracrine factors and pro-inflammatory cytokines from keratinocytes. Additionally, it exhibits antimicrobial efficacy against common skin pathogens like S. aureus and E. coli.
Research
Clinical Evidence
Medium confidence1%
Key findings
- 01 A significant anti-inflammatory and depigmenting effect was observed in an 8-week topical treatment study on UV-induced pigmented spots in female Asian subjects. This supports its efficacy in addressing hyperpigmentation and skin irritation.
- 02 In vitro studies demonstrated good antioxidant properties without toxicity to normal human skin keratinocytes (HaCaT cells).
- 03 In vitro screening identified activation of biological pathways including inhibition of STAT-3 transcription factor (implying reduction of inflammation and lesions in skin disorders) and an agonist effect on cannabinoid receptor type 2 (CB2), suggesting skin soothing and calming benefits.
- 04 Inhibition of melanin synthesis was observed in B16 melanoma cells, indicating potential for hyperpigmentation prevention and skin brightening without cytotoxic effects.
Transparency
Dusting Analysis
While some in-vitro antioxidant activities are observed at concentrations as low as 0.0005% (5 μg/mL), the sole topical clinical study demonstrating significant depigmenting and anti-inflammatory effects utilized a 1% concentration. Use significantly below this 1% threshold for similar claims may be considered dusting. Crucially, intermediate in-vitro concentrations ranging from 0.0075% to 0.025% have shown pro-oxidant and genotoxic activity in certain cell lines, necessitating careful concentration selection to ensure beneficial, rather than detrimental, effects.
The Formula
Formulation
Stability
The polyphenolic compounds within the extract, key to its efficacy, can become unstable in alkaline environments, potentially leading to their autoxidation and increased generation of reactive oxygen species (ROS). Flavonoids, another active component, exhibit enhanced solubility in ethanol compared to water, and their solubility generally improves with elevated temperatures.
Conflicts
- Alkaline mediums (due to polyphenol instability)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) and Scientific Committee on Consumer Safety (SCCS) have not specifically reviewed this ingredient. In vitro studies generally indicate no toxicity to normal human skin cells (HaCaT) and HepG2 cells at concentrations up to 0.01% (100 µg/mL). A brine shrimp lethality assay also found no toxicity up to 1% (10 mg/mL). However, it is important to note that one in vitro study reported pro-oxidant and genotoxic effects at higher concentrations (0.0075% and 0.025%) in specific cell lines, although genotoxicity diminished with prolonged exposure. Its traditional use for skin irritations, coupled with lack of reported general toxicity in human cells at relevant concentrations, suggests a low sensitization risk under careful formulation, but the pro-oxidant potential at specific concentrations warrants caution.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Glechoma Hederacea Flower/Leaf/Stem Extract offers valuable multi-functional benefits for skin, including clinical efficacy at 1% for anti-inflammatory and depigmenting effects, provided its concentration is carefully managed to avoid reported pro-oxidant activities observed at certain in-vitro levels.
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References
Sources