Science, Tech, Math › Science Make Your Own Natural Insect Repellent Share Flipboard Email Print Imgorthand / Getty Images Science Chemistry Chemistry In Everyday Life Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated January 13, 2020 You can make natural insect repellent yourself. The insect repellent is safe and effective, and it costs much less to make it than to buy it. Safety You can make your natural insect repellent with a few different formulations. These repellents involve diluting essential oils that the insects find distasteful or that confuse them. The oils don't mix with water, so you'll need to add them to other oils or to alcohol. It's important to use an oil or alcohol that is safe for your skin. Also, don't go overboard with the essential oils. They are potent and could cause skin irritation or another reaction if you use too much. If you are pregnant or nursing, do not apply an insect repellent, natural or otherwise, until after you've cleared it with your physician. Ingredients Different insects are repelled by different chemicals, so you'll get a more effective repellent if you combine a few insect-repelling natural oils. If you are making large amounts of insect repellent, a good rule of thumb is to mix the repellent so it's 5% to 10% essential oil, so mix 1 part essential oil with 10 to 20 parts carrier oil or alcohol. For a smaller batch use: 10 to 25 drops (total) of essential oils2 tablespoons of a carrier oil or alcohol The essential oils that work well against biting insects (mosquitoes, flies, ticks, fleas) are: Cinnamon oil (mosquitoes)Lemon eucalyptus or regular eucalyptus oil (mosquitoes, ticks, and lice)Citronella oil (mosquitoes and biting flies)Castor oil (mosquitoes)Orange oil (fleas)Rose geranium (ticks and lice) Safe carrier oils and alcohols include: Olive oilSunflower oilAny other cooking oilWitch hazelVodka Recipe Mix the essential oil with the carrier oil or alcohol. Rub or spray the natural insect repellent onto skin or clothing, using care to avoid the sensitive eye area. You'll need to reapply the natural product after about an hour or after swimming or exercise. Unused natural insect repellent can be stored in a dark bottle, away from heat or sunlight. If you wish, you can combine the oil with aloe vera gel to change the consistency of the resulting product.