Science
Mechanism of Action
This extract exerts its benefits through multiple biological pathways. It acts as a potent anti-inflammatory agent by inhibiting mast cell degranulation, reducing histamine release, and suppressing the production of pro-inflammatory mediators like nitric oxide (NO) and prostaglandin E2 (PGE2) through the inhibition of iNOS and COX-2 enzymes. It also inhibits leukotriene synthesis. As an antioxidant, it mitigates oxidative stress via components like fukinolic acid, activating the Nrf2 signaling pathway. For anti-photoaging, it reduces UVB-induced damage by inhibiting MMP-1 expression, enhancing COL1A1 levels, suppressing MAPK/AP-1 activation, activating TGF-β/Smad2/3 signaling, and balancing p53/p21 expression to prevent premature skin senescence.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 In vitro studies demonstrated significant reduction in leukotriene release from mast cells at concentrations ranging from 0.1% to 1.0% of a related Butterbur extract.
- 02 An in vitro study on RAW 264.7 cells showed a hot water extract of Petasites japonicus leaves effectively inhibited nitric oxide (NO) production, with a half-maximal inhibitory concentration (IC50) of 19 ± 4.9 µg/mL (approximately 0.0019%).
- 03 An aqueous leaf extract increased collagen synthesis in MC3T3-E1 cells dose-dependently at concentrations between 10–40 µg/mL (approximately 0.001% to 0.004%) in vitro.
- 04 An in vivo lactic acid stinging study demonstrated a soothing effect on skin, reducing the sting response, although a specific topical concentration for this benefit was not provided.
- 05 Oral administration of a hot water leaf extract to hairless mice for 13 weeks significantly reduced UVB-induced wrinkle area, epidermal/dermal thickening, and transepidermal water loss, while restoring collagen density and skin hydration by modulating key photoaging pathways.
Transparency
Dusting Analysis
There is no data to suggest Petasites Japonicus Leaf Extract is commonly 'dusted' or used at ineffective concentrations in formulations. The provided clinical data indicates clear effective concentrations in in vitro and some in vivo models.
The Formula
Formulation
Safety
Safety Profile
No specific CIR, SCCS, or FDA status for cosmetic use was found. General concerns regarding pyrrolizidine alkaloids (PAs) associated with butterbur are primarily linked to root and rhizome extracts and oral ingestion; leaf extracts are noted to contain significantly lower levels of these compounds. Oral safety studies of a hot water leaf extract showed no oral toxicity, repeated oral toxicity, or genotoxicity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Petasites Japonicus Leaf Extract is a valuable, multi-functional ingredient that delivers significant anti-inflammatory, soothing, and anti-photoaging benefits, making it an excellent addition for diverse precision skincare formulations.
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