For 2,000 years, households across China greeted the arrival of summer the same way. They tied bundles of mugwort and calamus above the doorway, let the leaves dry in the heat, and burned a handful at dusk so the smoke could drift through the rooms. They were not decorating. They were defending the house against the fifth lunar month, a stretch of the calendar that tradition named the Poison Month. So it is fair to ask what any modern reader would ask: Is there a genuine natural mosquito repellent buried in this tradition, or only ritual and hope?
The answer is more interesting than yes or no. One remedy that circulates widely today under the banner of old Chinese wisdom does not survive laboratory testing at all. Another, far older and far less famous outside China, holds up so well that researchers have measured it against DEET. This article separates the two. Along the way, it tells the strange story of how a kitchen oil that cannot repel a single mosquito helped shape one of the most widely used insecticide ingredients on earth.
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