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What are the internationally recognized effective mosquito repellent ingredients?
First of all, the only safe and effective mosquito repellent ingredient in the world is limonene, which is also the only pure natural plant ingredient recommended by the US Centers for Disease Control and Prevention!

Citronellol comes from eucalyptus citriodora leaf oil originating from eucalyptus citriodora leaves in Australia. Its main component is limonene. With fresh and fragrant leaves. Natural, safe and does not irritate the skin.

Lemon eucalyptus oil: the leaves of lemon eucalyptus originated in Australia. The eucalyptus citriodora leaf oil has a strong lemon flavor and a green flavor similar to citronella oil. The main components of eucalyptus citriodora leaf oil are citronellal, citronellol and citronellal acetate, among which citronellol and citronellal are indeed effective mosquito repellent components, but they cannot achieve the purpose of mosquito repellent for a long time.

Citronellol: It is found that citronellol contains a substance that can repel mosquitoes for a long time, which is natural, safe, non-irritating to the skin and lasts for a long time. First, citronellol and citronellal were separated from eucalyptus citriodora leaf oil by rectification, and then the purest monomer element, citronellol (PDM), was obtained by purification from citronellal. 57% citronellal (about 570 grams) can be obtained per kilogram of eucalyptus citriodora leaf oil, and only 302 grams of citronellol can be obtained after purification. Every time 1g citronellol is added, it is equivalent to using 3.3g citronellol, so the effective time of mosquito repellent will be greatly enhanced. So limonene is more expensive!