The research on essential oils is slow and financially not viable, unless chemical approximations of essential oils can be reproduced by pharmaceutical companies. Nonetheless, some research work with essential oils is finally coming onto the lab scene:

1.

2.Journal of Medical Entomology 43(5):889-895. 2006
doi: 10.1603/0022-2585(2006)43[889:FARPOE]2.0.CO;2

Fumigant and Repellent Properties of Essential Oils and Component Compounds Against Permethrin-Resistant Pediculus humanus capitis (Anoplura: Pediculidae) from Argentina

The treatment using plant extracts is not perfect but nothing in biology is. Let us give these essential oils at least a few (20-30 perhaps) years in the analytical labs to catch up to conventional pharmaceuticals. In the end, we may find that a combination treatment of plant extracts and pharmaceutical solutions is the most effective strategy for killing off lice, as well as many other unwanted parasites. After all, lab formulations stay the same until their efficacy is shown to be waning, while living organisms, such as plants, are constantly evolving.

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