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Eucalyptus oil

Every natural first-aid kit needs a natural bug repellant—and not all of them are created equal. Research shows that lemon eucalyptus oil is as effective against mosquitos as low concentrations of DEET. The Environmental Working Group recommends products with a concentration of 30 to 40 percent eucalyptus oil to protect for long periods of time (but don’t use on children younger than 3 because they might get it in their noses, where it could be toxic at high doses).