Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Cedar, particularly cedarwood oil derived from various species of cedar (such as Juniperus virginiana and Cedrus atlantica), has a documented history of use as an insect repellent. Scientifically, there is moderate evidence supporting its efficacy. Studies have shown that cedarwood oil contains compounds like cedrol and thujopsene, which exhibit repellent activity against several types of insects, including mosquitoes, moths, ants, and fleas. These effects are believed to be due to the volatile aromatic compounds that interfere with the insects' sensory perception or act as toxins to them.

Research published in peer-reviewed journals indicates that cedarwood oil can deter or kill various insect pests, although its efficacy may not match that of synthetic repellents such as DEET. For example, laboratory and field studies have demonstrated repellency against mosquitoes and efficacy in protecting stored products from insect infestation. The U.S. Environmental Protection Agency (EPA) recognizes cedarwood oil as a minimum-risk pesticide, acknowledging its use in natural insect repellent formulations.

While the evidence base is not as extensive or robust as for some other natural repellents, such as citronella or eucalyptus, there is enough scientific validation to support the traditional use of cedar as an insect repellent. Its use is generally considered safe for humans and pets, which has contributed to its popularity in commercial and homemade repellent products.

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