Science
Mechanism of Action
Psidium Guajava Leaf Extract primarily functions as a potent antioxidant, neutralizing free radicals to prevent cellular oxidative damage. It mitigates inflammatory responses by reducing mediators such as nitric oxide and prostaglandin E2, thus calming irritation and redness. Its antimicrobial properties are broad-spectrum, inhibiting various bacterial strains like S. aureus and preventing biofilm formation. Additional actions include an astringent effect for refined pores, tyrosinase inhibition for reduced melanin synthesis and improved skin tone, and collagenase inhibition, supporting its anti-aging claims by enhancing skin texture and minimizing fine lines. The extract also contributes to overall skin hydration.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Achieved 90.7% DPPH radical scavenging activity when extracted with 70% ethanol, demonstrating potent antioxidant effects.
- 02 Guava Leaf Polysaccharides (GLPs) exhibited good antioxidant capacity with 56.38% DPPH radical-scavenging activity and 51.73% ABTS radical cation-scavenging capacity.
- 03 Prevented biofilm formation by 77% against periodontal pathogens, indicating significant antimicrobial potential.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The natural bioactive compounds in Psidium Guajava Leaf Extract exhibit sensitivity and instability during storage, suggesting that advanced delivery systems such as encapsulation, microemulsion, or nanosuspension could enhance stability. A 10% (w/w) powder formulation demonstrated strong antibacterial activity and minimal degradation of active pharmaceutical ingredients, though some color changes were noted in accelerated stability tests. Optimal formulation pH is typically within the 4.0-6.0 range.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has indicated 'Insufficient Data or Information' for cosmetic use, meaning a maximum safe concentration has not been formally established. However, for food applications, it is designated as safe for general or specific, limited use by the U.S. Food and Drug Administration (FDA). Acute oral toxicity studies in animals reported a median lethal dose (LD50) greater than 5000 mg/kg body weight, suggesting a very low acute toxicity profile. Non-irritancy was observed in human tests using a hand sanitizer containing the extract, and the Environmental Working Group (EWG) Skin Deep database rates it with low concerns across various toxicity categories.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Psidium Guajava Leaf Extract is a valuable botanical ingredient, offering a broad spectrum of benefits from antioxidant and anti-inflammatory properties to antimicrobial and skin-brightening effects, with a low risk of irritation across all skin types.
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