Citronella oil is an essential oil that’s made from the distillation of the Asian grass plant in the Cymbopogon genus. This fragrant grass got its name from the French word meaning “lemon balm,” due to its floral, citrus-like aroma.
Like many essential oils, citronella oil has certain benefits, and has been used in China and Indonesia for centuries to treat rashes, infections, and other health conditions.
Today, citronella oil is probably best known as a natural insect repellant, but its uses and benefits extend beyond keeping bugs at bay.
In this article we’ll explore the benefits of citronella oil, how you can use it, and what to look for when you shop for the oil.
For centuries, citronella has been used for a variety of purposes, including:
- as an insect repellent
- as an antifungal agent
- to treat parasitic infections
- to promote wound healing
- to lift mood or fight fatigue
- in perfumes or as a flavor additive in food
But does scientific research support these uses? While research into citronella and other essential oils continues, there’s some evidence that citronella oil does have certain health benefits.
Let’s take a deeper dive into what research has found so far.
The study also found that DEET provided protection for a much longer period of time than just citronella oil on its own.
Citronella and fennel oil had protection ratings of about 57 percent and 47 percent, respectively, after only two hours.
Another study assessed the effectiveness of several mosquito repellents, and concluded that citronella candles were of little use as a mosquito repellent.
Citronella needs to be reapplied often to be an effective mosquito repellent. However, it may provide protection for up to three hours if it is combined with vanillin. Studies show that it is not as effective as DEET at keeping mosquitos away.
Several studies have found that citronella oil has certain antifungal properties that may help weaken or destroy certain types of fungi that can cause health problems.
The study found that citronella oil had the ability to destroy the cell wall of the fungus and kill the organisms within the cell that can cause infection. This led the researchers to suggest citronella oil may have the potential to be used as a safe and environmentally friendly fungicide.
Both essential oils initially reduced the number of viable microorganisms. However, after 48 hours the effect wasn’t significant. The authors suggest that a daily application of a solution of either oil may be effective in reducing this fungus.
Citronella oil seems to be an effective antifungal agent. In some cases, it may need to be reapplied daily to keep fungal infections under control.
It also has antibacterial properties, but it is not as effective at killing a broad spectrum of bacteria and germs as some other essential oils.
Based on recent research, citronella oil may have the potential to speed up the healing of wounds. This may be of particular importance for people with diabetes, as wounds tend to heal more slowly with this condition.
Citronella oil’s antifungal and anti-inflammatory properties may help to speed up the healing of wounds. However, research in this area is limited and more studies need to be done on humans to determine how effective it is.
Limited research has shown that inhaling citronella resulted in weight loss and lower cholesterol levels in rats. More studies need to be done to determine how effective it is with weight loss in humans.
Physiological effects of inhalation
A 2001 study investigated the effects of inhaling citronella, lavender, and rosemary essential oils. Lavender was found to have a relaxing effect and rosemary was found to have a stimulating effect on the brain. Citronella, on the other hand, had a more complex in-between effect. The writers suggest that the effects of citronella could vary by individual.
When inhaled, citronella may have a relaxing effect on some people and a stimulating effect on others.
You can use citronella oil in a variety of ways. Here are some suggestions.
A spray application may be good for freshening up a room or applying to your skin as an insect repellent. To make a citronella oil spray:
- Add citronella oil to water in a glass spray bottle. The National Association for Holistic Aromatherapy (NAHA) recommends 10 to 15 drops per ounce of water.
- Optional step: Essential oils don’t dissolve in water. Consider adding a dispersing agent such as solubol to your solution.
- Shake the bottle well before spraying.
Because citronella oil has a shorter time span of effectiveness than repellents like DEET, you will need to reapply more often if you’re using it as an insect repellent.
A diffuser can be used to disperse a scent through a room. Like the spray application, you may want to use this method to repel insects or add a pleasant fragrance to a room.
Diffusers typically come with a specific set of instructions. To use citronella oil safely in a diffuser, be sure to follow the product instructions carefully.
Massage oils and creams
Citronella oil can also be added to oils and creams for topical applications. Using citronella oil in this way may help kill germs and fungi on the skin and also promote wound healing.
Always dilute essential oils in a carrier oil before being applying to the skin.
Here’s how to make a citronella massage oil or lotion.
To make a massage oil:
- Dilute citronella oil in a carrier oil, like jojoba oil or coconut oil.
- The NAHA recommends adding 15 drops of essential oil per ounce of carrier oil for a 2.5 percent dilution.
- For sensitive skin, you may want to use a one percent solution (6 drops per ounce of carrier oil).
To make a cream or lotion:
- Dilute citronella oil in an unscented cream or lotion.
- The NAHA recommends using a 1 to 2.5 percent dilution for normal skin (6 to 15 drops per ounce), and a 0.5 to 1 percent dilution for sensitive skin (3 to 6 drops per ounce).
Follow these tips for using citronella oil safely:
- Always dilute citronella oil properly before using. Never use undiluted citronella oil on your skin.
- Essential oils are very concentrated and can be toxic if consumed. Keep citronella oil out of reach of children and pets.
- Don’t take citronella oil internally.
- When using citronella oil for aromatherapy, make sure the space you’re in is well-ventilated. Consider children and pets who might be inhaling the aromatherapy. Some essential oils are dangerous.
- If you’re pregnant, breastfeeding, or taking any prescription medications, talk to your doctor before using citronella oil.
Citronella oil can cause skin irritation or allergy. When this happens, the area may become red, blotchy, itchy, or swollen.
If you’re concerned about a possible skin reaction, test some diluted citronella oil on a small area of your skin before using it for topical applications. If you have a reaction, avoid using citronella oil or products that contain it.
Although anaphylaxis, a severe allergic reaction, hasn’t been documented in response to citronella oil, it’s good to know the signs since it’s a medical emergency. Look out for:
- difficulty breathing
- wheezing or coughing
- swollen throat
- red rash
- tightness in the chest
You can find citronella oil in natural food stores or online.
To find a good quality oil, keep these tips in mind:
- Look for a scientific name on the label — Cymbopogon nardus or Cymbopogon winterianus. You may also see C. nardus referred to as “Ceylon type” and C. winterianus referred to as “Java type.”
- Note that lemongrass (Cymbopogon citratus) is a different essential oil but has a similar scientific name. If you’re looking for citronella, don’t confuse the two.
- Make sure the oil is in a dark-colored bottle as light can damage essential oils.
- If possible, smell the oil before buying. Citronella has a distinct scent. If it doesn’t smell like citronella, don’t buy it.
- Be cautious of any claims that a product treats a specific condition. The FDA doesn’t regulate essential oils in the same way as drugs.
- Check the label for a purity statement. If the product isn’t 100 percent essential oil, the label should let you know.
Citronella oil is often used as an insect repellent, although research has indicated it may also have antifungal properties and help with wound healing.
You can use citronella oil in a diffuser or spray bottle, or you can dilute it in an oil or lotion before applying it to your skin.
If you have questions or concerns about citronella oil, talk to your doctor before using it.