Science
Mechanism of Action
Manuka oil's therapeutic efficacy is attributed to its high concentration of cyclic triketones, including Leptospermone, Iso-leptospermone, and Flavesone. These compounds primarily exert antibacterial and antifungal actions by disrupting bacterial cell membranes, leading to cellular degradation. The oil also contains antioxidant chemicals like γ-terpinene and terpinen-4-ol. It actively suppresses UV-B induced skin inflammation by inhibiting the production of inflammatory cytokines and can block harmful UVB radiation, which helps prevent skin protein damage, collagen degradation, and premature aging. Its antimicrobial properties specifically target breakout-causing bacteria, while overall it promotes skin regeneration and calms reactive skin states.
Research
Clinical Evidence
High confidenceFor targeting acne-causing bacteria, efficacy is observed around 0.2% to 0.25%. For broader anti-inflammatory and antioxidant benefits, concentrations up to the recommended maximum of 5% can be utilized, noting that a 10% concentration demonstrated significant anti-photoaging effects in mouse models.
Key findings
- 01 Significantly reduced wrinkle length, depth, and area, and suppressed UV-B induced skin inflammation in UV-B irradiated hairless mice, correlating with inhibited collagen fiber content loss and epidermal hyperplasia, demonstrating anti-photoaging effects.
- 02 Exhibited bactericidal effects against Propionibacterium acnes, a key bacterium implicated in acne formation.
- 03 Triggered apoptosis (programmed cell death) and activated c-Jun N-terminal kinase (JNK) in fibroblasts and fibrosarcoma cells, suggesting potential for cellular renewal.
- 04 Demonstrated minimal bactericidal concentration for 6 different oral bacteria.
Transparency
Dusting Analysis
Information regarding 'dusting' for this ingredient is not available in the provided research data.
The Formula
Formulation
Stability
As an essential oil, it appears as a pale yellow to amber brown, slightly viscous liquid. It exhibits a shelf life of 12 months or longer when stored properly in an air-tight, light-protected container. It is soluble in alcohol and insoluble in water.
Safety
Safety Profile
The ingredient is classified as non-hazardous according to UN-GHS Criteria and OSHA HCS. Skin irritation tests show a Primarily Irritation Index (PII) of 0.0, indicating it is non-irritating. A Repeated Patch Insult Test on 50 human volunteers further confirmed it as a non-irritant and non-sensitizer. A 10% concentrate in water was found to be non-irritating to the eyes, and it is considered essentially non-toxic with an LD50 > 9,000 MG/KG in rats. While a recommendation for usage levels up to 5% in fragrance concentrate exists, no explicit review by CIR or SCCS was found within the provided research.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Leptospermum Scoparium Branch/Leaf Oil is a valuable ingredient, demonstrating potent antimicrobial, anti-inflammatory, and antioxidant benefits that effectively address acne, soothe irritation, and combat photoaging, all within a favorable safety profile.
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