Science
Mechanism of Action
This extract functions as a potent antioxidant, primarily via constituents such as rosmarinic acid, flavonoids, phenolic acids, and diterpenes, to protect skin cells from free radical damage and environmental aggressors. It exerts anti-inflammatory effects by having carnosol and carnosic acid downregulate key inflammatory markers like IL-1β and TNF-α. Additionally, it offers antimicrobial benefits to help control breakouts, acts as an astringent to refine skin tone and regulate sebum, and supports anti-aging by preserving collagen and elastin fibers. Its photoprotective capabilities include inhibiting UV-induced metalloproteinase-1, mitigating sun-related skin damage.
Research
Clinical Evidence
High confidence0.2%
Key findings
- 01 Topical application of an unspecified hydroalcoholic rosemary extract complexed with algae proteins demonstrated effective action against pollution-induced oxidative skin damage.
- 02 Formulations containing Rosmarinus Officinalis Leaf Extract at concentrations up to 0.2% were determined to be non-irritants or non-sensitizers.
Transparency
Dusting Analysis
While the recommended usage in cosmetic formulations spans 0.2-5%, the CIR Expert Panel concluded that Rosmarinus Officinalis Leaf Extract is safe at concentrations ≤0.2% in leave-on products. Concentrations exceeding 0.2% in leave-on applications may present a sensitization risk for sensitive individuals if not specifically formulated to mitigate this.
The Formula
Formulation
Stability
The extract can function as a potent preservative within formulations, contributing to longer product shelf life.
Conflicts
- Strong oxidizers
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded Rosmarinus Officinalis Leaf Extract is safe at concentrations ≤0.2% in leave-on products and safe in rinse-off products when formulated to be non-sensitizing. While generally well-tolerated, its aromatic components may trigger sensitivity in individuals; a patch test is recommended. Consumers with fragrance allergies should avoid this ingredient. It is important to differentiate this extract from rosemary leaf oil, which contains higher levels of volatile, potentially irritating compounds like camphor.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Rosmarinus Officinalis Leaf Extract is a valuable, multi-beneficial ingredient providing antioxidant, anti-inflammatory, and sebum-regulating effects, provided it is precisely formulated at concentrations not exceeding 0.2% in leave-on products to minimize sensitization risk.
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