At a Glance
- Citronella is a medicinal plant rich in essential oils including citronellal, citronellol, geraniol, linalool, and cis-calamenene, with insect repellent, antibacterial, antifungal, and calming properties
- Citronella essential oil is registered with the US EPA as an insect repellent due to its high efficacy, low toxicity, and consumer acceptance
- Citronella oil is used in small amounts to flavor foods, scent cosmetics, and repel insects
- Two commercial varieties exist: Java citronella (higher quality, more citronellal and citronellol) and Ceylon citronella (lighter composition, more monoterpenes)
- A 2024 study found citronella aromatherapy reduced cortisol levels by up to 18% in stressed individuals
- Main limitation as an insect repellent: short protection time of under two hours unless formulated with fixatives or vanillin
- Used across personal care, natural cleaning products, food flavoring, animal repellents, and fine fragrance
Most Americans know citronella from one context: the yellow candle on a patio table or a tiki torch trying to keep mosquitoes away at a summer barbecue. That is a legitimate use, but it is probably the least efficient way to deploy the ingredient. Citronella oil, properly formulated and applied, does considerably more than that limited outdoor furniture context suggests.
Citronella is different from lemongrass. The two are often confused because they come from the same genus of grass, Cymbopogon. Lemongrass has a sweet smell reminiscent of lemon, while citronella has a very strong smell similar to a disinfectant. Lemongrass is Cymbopogon citratus, while citronella is Cymbopogon nardus or Cymbopogon winterianus, and they have different properties. Knowing which plant you are working with matters when sourcing, formulating, or communicating with consumers about ingredient identity.
What Is Citronella: The Plant, the Chemistry, the Two Types
Citronella essential oil is a mixture of components including citronellal, citronellol, and geraniol as major constituents, contributing to various biological activities including antimicrobial, anthelmintic, antioxidant, anticonvulsant, antitrypanosomal, and wound healing effects, besides its mosquito repellent action.
The relative amounts of these compounds differ significantly between the two commercial varieties, and that affects both performance and price:
| Property | Java Citronella (Cymbopogon winterianus) | Ceylon Citronella (Cymbopogon nardus) |
| Citronellal | Around 33% | Around 5 to 8% |
| Citronellol | Around 16% | Around 8% |
| Geraniol | 18 to 21% | 18 to 21% |
| Monoterpenes | 1 to 3% | Around 27% |
| Quality grade | Superior, higher potency | Lower grade |
| Price | Higher | Lower |
| Primary use | Quality repellents, cosmetics, fragrance | Commodity products, candles |
Java citronella is the grade that serious formulators use when performance matters. The higher citronellal and citronellol content gives it stronger repellent efficacy, better antimicrobial activity, and a more refined fragrance profile. Ceylon citronella is primarily used in lower-cost applications where the quantity of active compounds matters less than the general citrus-herbal scent.
What Is Citronella Used For: Applications Across Industries?
Insect Repellent: The Core Use Case
Mosquito-borne diseases such as malaria, filariasis, chikungunya, yellow fever, dengue, and Japanese encephalitis are major causes of morbidity and mortality globally, and citronella essential oil is among the natural compounds most extensively researched as an alternative to synthetic repellents.
The honest picture on citronella versus DEET is this: citronella products are less effective than DEET products in terms of duration of protection, with a difference in protection time of 253 minutes against Aedes mosquitoes in controlled studies. That is a real gap and it should not be minimized in consumer communication.
But the story is more nuanced than a simple DEET wins comparison. At concentrations of 20 to 25%, citronella provided equivalent mean protection time of 480 minutes to DEET at the same concentrations against Anopheles and Culex species. Protection time and efficacy are mosquito-species dependent.
The formulation makes a significant difference:
- Citronella oil protects for under two hours on its own. Formulations with fixatives like vanillin can increase this protection time significantly
- Nanostructured lipid carrier encapsulation of citronella oil creates a repellent reservoir on the skin surface, releasing active ingredients slowly through volatilization and extending repellent action
- Adding 5% vanillin to 25% citronella provides up to 480 minutes protection against Anopheles, outperforming 25% DEET in some studies
- Microencapsulation technology is becoming more commercially viable, addressing the volatility limitation that has historically held citronella back versus synthetics
For US consumers who want a DEET-free option for low-risk outdoor activities, properly formulated citronella at 10 to 25% with a fixative is a practical choice. For high-risk mosquito-borne disease situations, it should be a secondary option to proven synthetics.
Natural Cleaning and Household Products
Citronella integrates easily into household cleaning products including homemade disinfectant sprays mixed with water and vinegar, where it provides both antimicrobial function and fragrance.
A 2023 lab analysis found that citronella oil disrupted bacterial cell membranes, particularly effective against Staphylococcus aureus and Escherichia coli. Its antifungal properties have been demonstrated against Candida albicans colonies, offering a natural alternative to synthetic antifungals in cleaning formulations.
For the growing US market of plant-based household cleaners, citronella is a practical ingredient that adds real antimicrobial function rather than just fragrance, which is a genuine formulation advantage over purely decorative botanical additives.
Fragrance and Perfumery
Citronella oil is one of the primary natural sources of citronellol and geraniol, two of the most widely used fragrance compounds in fine perfumery and personal care. Citronella oil is used in small amounts to flavor foods and scent cosmetics, and its distinctive fresh, lemony-green character is used as a top note modifier in many fragrance compositions.
Beyond the finished fragrance application, citronella oil is used industrially as a raw material for isolating and further processing geraniol and citronellol, which are then used independently in fragrance synthesis. This makes citronella oil a significant upstream ingredient in the fragrance industry even when the finished product does not smell like citronella at all.
Personal Care and Skincare
A 2025 clinical trial observed that topical applications of low-concentration citronella oil significantly reduced redness and inflammation in individuals with acne-prone skin. Its anti-inflammatory compounds help calm redness, itching, and minor irritation, making it ideal for sensitive or acne-prone skin.
Citronella’s applications in personal care go beyond fragrance:
- Natural deodorant formulations where antimicrobial activity targets odor-causing bacteria
- Shampoos and scalp treatments where antifungal properties support dandruff management
- Body washes and soaps where the combination of fragrance and antimicrobial function adds dual value
- Herbal soaps combining citronella with aloe vera and other botanicals for functional skincare benefits
Research into citronella oil’s wound healing potential shows that the combination of antifungal and anti-inflammatory effects led to accelerated wound healing in Candida-infected wound models, though this research is still largely in animal models and human clinical data is limited.
Aromatherapy and Mood Support
Inhaling citronella’s scent activates olfactory receptors linked to the limbic system, triggering calming neural responses. A 2024 study found that citronella aromatherapy reduced cortisol levels by up to 18% in stressed individuals, promoting relaxation and improved mood.
The mood effect of citronella is distinct from pure relaxation. A 2001 study comparing citronella, lavender, and rosemary essential oils found that lavender had a clearly relaxing effect and rosemary had a stimulating effect, while citronella had a more complex in-between effect that varies by individual. This makes it useful as a mood balancer rather than a sedative, which suits daytime diffusing and workplace wellness applications better than pre-sleep routines.
Food Flavoring
Citronella oil is used in small amounts to flavor foods and has been used in aromatic teas for traditional applications. The flavor contribution is fresh and citrus-herbal, and at the trace levels used in food, there is no safety concern. The FDA includes citronella in its list of flavoring substances permitted for use, and food-grade citronella oil is produced to different purity standards than cosmetic or industrial grades.
Animal Repellent Applications
Beyond mosquitoes, citronella is used in companion animal care products. Dog collars, pet sprays, and training deterrent products use citronella as an aversive scent to discourage behaviors like excessive barking or territory marking. This is entirely separate from the human insect repellent application and relies on the fact that dogs find the scent strongly unpleasant rather than on any toxic effect.
Safety: What You Need to Know Before Using Citronella
Side effects from using citronella on skin can include redness, itching, irritation, swelling, or blemishes, which are signs of allergic skin reaction. If these occur, cleanse with plenty of water, discontinue use, and consult a doctor.
Topical repellent formulations use concentrations of 5 to 10% citronella oil. Higher concentrations can cause skin sensitivity. Unlike DEET or picaridin, there is no controversy about systemic toxicity at normal use concentrations. The primary risks are local skin irritation and allergic contact dermatitis in sensitive individuals.
Specific groups requiring extra care:
- Children, pregnant, or breastfeeding women should only use citronella as advised by a doctor
- Never apply undiluted citronella oil directly to skin. Always dilute in a carrier oil to 1 to 3% for topical use
- Avoid applying near eyes or mucous membranes
- Citronella is not safe for oral consumption beyond food-grade flavoring applications. The essential oil used in repellents and cosmetics should not be ingested
The EPA registration for citronella as an insect repellent is for external use only. The registration reflects a documented safety assessment covering both human health and environmental impact, which is one reason citronella is consistently recommended as a starting point for parents looking for DEET-free options for children, provided the formulation and concentration are appropriate.
The US Market: Where Citronella Demand Is Growing
The natural personal care and home fragrance markets in the US are both driving citronella demand. The clean beauty movement’s push away from synthetic fragrance has increased interest in geraniol and citronellol, both of which can be sourced as citronella derivatives. The household cleaning segment’s shift toward plant-derived antimicrobials has created demand for citronella as a functional ingredient rather than just a fragrance.
The insect repellent category is also evolving. Nanotechnology encapsulation of citronella is now commercially viable and several US brands have launched extended-protection citronella repellents that compete more directly with synthetic alternatives on duration. This formulation innovation addresses the historically short protection window that limited citronella’s market position against DEET.
Indonesia and Sri Lanka are the primary global sources of commercial citronella oil, with Java variety from Indonesia commanding premium pricing and representing the majority of quality-grade supply for US personal care and fragrance applications.
Conclusion
What is citronella used for covers a wider range than the backyard candle context most US consumers know. It is an EPA-registered insect repellent with real but time-limited efficacy that formulation technology is actively improving. It is a source of two of perfumery’s most important natural fragrance compounds. It brings genuine antimicrobial function to natural cleaning and personal care products. It has demonstrated aromatherapy effects on stress reduction. And it is an established food flavoring ingredient at trace levels.
What is citronella in terms of practical supply chain importance for US manufacturers? It is a botanical ingredient with multiple commercial pathways, significant formulation complexity, and growing demand in both personal care and household product categories. For cosmetic formulators, personal care brands, repellent manufacturers, and fragrance houses sourcing Java or Ceylon citronella oil, isolated citronellal, geraniol, or citronellol at commercial scale, Elchemy connects US buyers with verified global suppliers in Indonesia, Sri Lanka, and India offering complete technical documentation, GC/MS certificates of analysis, and supply chains built for the compliance demands of the American personal care and fragrance market.
