Science
Mechanism of Action
This botanical oil demonstrates antibacterial activity by targeting common skin pathogens such as Staphylococcus epidermidis, Staphylococcus aureus, and Propionibacterium acnes. It contributes to melanin production and provides protection to melanocytes against oxidative stress by modulating endoplasmic reticulum (ER) stress and regulating pro-inflammatory cytokines like interleukin-6 (IL-6). Further mechanisms include anti-inflammatory and antioxidant actions attributed to its flavonoid content, and support for skin and wound healing, likely mediated by alkaloids and terpenes. Additionally, it possesses antifungal characteristics.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Ethanolic extracts (50-90%) demonstrated moderate antibacterial activity against Staphylococcus epidermidis, Staphylococcus aureus, and Propionibacterium acnes, with a 90% extract showing average MIC/MBC for P. acnes at 1.38 ± 0.66 mg/mL and for staphylococcal strains at 2.1 ± 1.16 mg/mL (MIC) and 2.86 ± 1.2 mg/mL (MBC).
- 02 A 50 μg/mL extract promoted melanin production and protected PIG3V melanocytes from 4-tert-butylphenol-induced oxidative damage by downregulating ER stress and pro-inflammatory cytokines, with no cytotoxic effects observed at this concentration.
- 03 A 5% methanolic extract significantly enhanced wound healing in rats compared to controls, suggesting a role for its alkaloids and terpenes in this process.
Transparency
Dusting Analysis
No data available to suggest 'dusting' as a common practice or concern for Ruta Graveolens Herb Oil.
The Formula
Formulation
Stability
Due to its furanocoumarin content, particularly bergapten, products containing Ruta Graveolens Herb Oil require careful formulation to minimize UV exposure. Maintaining stability and safety necessitates limiting bergapten levels, especially in leave-on products applied to sun-exposed skin.
Conflicts
- UV exposure (potential for severe phototoxic reactions due to furanocoumarins like bergapten)
- Other phototoxic ingredients (potential for additive or synergistic phototoxic effects)
Safety
Safety Profile
Ruta Graveolens Herb Oil is notably phototoxic due to furanocoumarins like bergapten. The International Fragrance Association (IFRA) advises that for leave-on applications on skin exposed to sunshine, the total bergapten level in consumer products must not exceed 0.0015% (15 ppm). While an IFRA Category 11B limit allows up to 0.15% for minimal transfer products with potential UV exposure, the stricter bergapten limit for direct skin contact in sun applies to precision skincare. Externally, it is an active irritant and has rubefacient properties. Toxicity from ingestion has been observed in animal studies (affecting kidneys, potential uterine hemorrhaging), though this is distinct from topical application. The FDA lists 'Oil of rue' as Generally Recognized as Safe (GRAS) for use as a flavoring agent, which does not pertain to its topical safety profile.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite intriguing biological activities shown in extract studies, the high irritancy, severe phototoxicity, and extremely low safe concentration limits for Ruta Graveolens Herb Oil make it unsuitable for precision skincare formulations.
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