Science
Mechanism of Action
This extract primarily owes its activity to salicin (a compound also found in higher concentrations in willow bark), alongside polyphenols and flavonoids. Salicin exhibits aspirin-like properties, delivering anti-inflammatory effects and regulating genes crucial for skin aging, collagen production, and elasticity maintenance. It provides gentle exfoliation by facilitating dead skin cell removal and promoting cellular renewal. Furthermore, it functions as an antioxidant, neutralizes free radicals, acts as an astringent to refine pores, and helps balance oil production. Its antimicrobial properties, ability to stimulate cell turnover, and contribution to moisture retention underscore its comprehensive skin benefits.
Research
Clinical Evidence
Medium confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Optimal stability for Salix Alba extracts, particularly bark, is generally observed within a pH range of 6.0 to 8.0. Aqueous extracts from Salix Alba bark have been adjusted to pH 6.8 for optimal stability and solubility; similar characteristics are anticipated for leaf extracts.
Conflicts
- Individuals with known hypersensitivity or allergies to aspirin (salicylates)
- Children under 3 years of age (with exceptions for certain shampoos in China)
- Pregnant or nursing women
- Individuals with active peptic ulcers, glucose-6-phosphate dehydrogenase deficiency, severe liver or kidney dysfunction, or coagulation disorders (based on oral supplement guidance)
- Formulations intended for inhalation exposure or oral consumption
- Generally, other ingredients that do not combine well with salicylic acid, due to shared properties with salicin.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel is currently reviewing 'Salix alba (Willow)-Derived Ingredients,' which includes Salix Alba Leaf Extract. The stated maximum concentration of 3.00% for leave-on products (4.60% for rinse-off) applies specifically to Salix Alba Bark Extract, and carries restrictions against use in children under 3 years (except certain shampoos in China), applications leading to inhalation exposure, or oral products. Due to its salicin content and aspirin-like properties, precautions related to Reye's syndrome are advised for products containing Salix alba (willow) bark, extending to children, pregnant/nursing women, and individuals sensitive to aspirin. While a hydroalcoholic bark extract was predicted non-irritating in an in vitro assay, an aqueous bark extract demonstrated sensitizing potential in some in vitro assays; however, a serum containing 0.0025% Salix Alba Bark Extract was non-irritating and non-sensitizing in a Human Repeat Insult Patch Test (HRIPT).
Your Skin
Skin Compatibility
Our Assessment
Verdict
Salix Alba Leaf Extract is a valuable multi-functional ingredient suitable for a wide range of skin types, offering significant anti-inflammatory, anti-aging, and exfoliating benefits, though its specific clinical efficacy and safety data often reference the more extensively studied bark extract or its active component salicin.
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