Science
Mechanism of Action
This extract combats skin damage through multiple pathways. Its rich profile of flavonoids, terpenes, and hop bitter acids acts as potent radical scavengers, inhibiting lipid peroxidation and providing robust antioxidant protection. For inflammation, constituents like humulone and lupulone reduce pro-inflammatory cytokines such as IL-6 and IL-8, and inhibit TNF-α induced inflammation and NF-κB activation, thereby soothing redness and sensitivity. Furthermore, its antimicrobial action helps regulate sebum and targets bacteria like Propionibacterium acnes, contributing to acne prevention, while its astringent qualities refine pores and promote skin texture improvement.
Research
Clinical Evidence
Medium confidence1%
Key findings
- 01 In a UVB erythema study on human skin, 1% Humulus Lupulus Extract formulated in an oil-in-water (O/W) cream exhibited anti-inflammatory effects comparable to 1% hydrocortisone acetate. This effect was not observed in water-in-oil (W/O) formulations, emphasizing vehicle importance.
Transparency
Dusting Analysis
While Humulus Lupulus Extract demonstrates significant anti-inflammatory efficacy at 1% in oil-in-water formulations, the Cosmetic Ingredient Review (CIR) reported the highest dermal use concentration as 0.13%. This substantial difference suggests that many products might use the extract at concentrations too low to achieve the clinically demonstrated anti-inflammatory benefits, leading to potential 'dusting' where the ingredient is present but not functionally effective.
The Formula
Formulation
Stability
Optimal efficacy for anti-inflammatory benefits is observed in oil-in-water (O/W) cream formulations, with significantly reduced effectiveness in water-in-oil (W/O) systems. O/W emulsions containing the extract have shown stability for at least 3 months at a pH range of 5.62-5.64.
Safety
Safety Profile
The CIR Expert Panel deems Humulus Lupulus Extract safe in cosmetics when formulated to be non-sensitizing, with the highest reported concentration of dermal use at 0.13%. Concerns were noted for specific constituents like 8-prenylnaringenin (potential estrogenic effects), β-myrcene (potential dermal irritant/carcinogen), and quercetin (potential genotoxicity), though these are generally considered not relevant at typical cosmetic exposure levels. Formulators are advised to manage impurity levels. It is recognized as safe (GRAS) by the FDA for consumption and approved under EU regulations. Clinical studies at 0.125% showed no contact sensitization.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Humulus Lupulus Extract is a valuable ingredient offering significant anti-inflammatory, antioxidant, and antimicrobial benefits, particularly when formulated appropriately in oil-in-water systems at effective concentrations of 1% or higher.
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