Evidence supporting the use of: Mountain horopito
For the health condition: Insect Repellant

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Synopsis

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

Mountain horopito (Pseudowintera colorata), a native New Zealand shrub, has a longstanding history of traditional use by Māori and early European settlers. Anecdotal reports and ethnobotanical records indicate that horopito leaves were sometimes crushed and applied to the skin to help repel insects, as well as to soothe bites and stings. The pungent, peppery compounds in horopito—especially polygodial—are thought to contribute to its deterrent effects against insects.

However, while its use as an insect repellent is supported by tradition, there is limited scientific research to substantiate its efficacy for this purpose. Most modern studies on horopito focus on its antifungal and antimicrobial properties rather than its potential as an insect repellent. There are some laboratory findings that polygodial can deter certain invertebrates, but these are not directly linked to topical human use or formulated insect repellents.

In summary, horopito’s use for insect repellency is primarily justified by tradition, with limited scientific validation. More rigorous research would be needed to confirm its effectiveness and safety as a topical insect repellent.

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Products containing Mountain horopito

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