Synopsis

Source of validity: Scientific
Rating (out of 5): 2

The use of Brazilian peppertree (Schinus terebinthifolia) as an insect repellent is supported by some scientific evidence, although it is still considered preliminary. Several laboratory studies have investigated the essential oil derived from the leaves and fruits of the plant for insecticidal and repellent properties. For instance, research published in the journal Parasites & Vectors (2011) demonstrated that the essential oil exhibited moderate repellency against Aedes aegypti, the mosquito vector for dengue and Zika viruses, though its efficacy was less than that of DEET. Another study published in Industrial Crops and Products (2013) showed that the oil had larvicidal effects against mosquito larvae. The active compounds believed to be responsible include monoterpenes such as alpha-pinene and limonene, which are known for their insect-repellent properties.

Despite these findings, the evidence is not robust, as most studies are in vitro or conducted under laboratory conditions, and there is limited data on its safety and effectiveness in humans or real-world settings. Additionally, there is little evidence of a strong traditional use of Brazilian peppertree specifically for insect repellent purposes, with most traditional uses focused on its antimicrobial and anti-inflammatory properties. Therefore, while there is some scientific justification for its insect-repellent activity, further research is needed to confirm its efficacy and safety for practical application.

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