Citronella Oil — Complete Guide to Benefits, Uses, DIY Recipes & Safety (2026)

By OotyMade · Nilgiris Essential Oils · Updated April 2026

Citronella oil is one of the most misunderstood essential oils in India. Most people know it only as "the mosquito repellent candle smell" — but the full scope of what citronella oil does, how it works, and how to use it correctly for skin, hair, home, and insect protection is significantly broader than that single association.

This is the complete guide — the science behind how it works, every proven use, five DIY recipes you can make at home, and the complete safety framework you need before using it. Written from the Nilgiris, where citronella grass has been cultivated and distilled for generations.

⚠️ SAFETY FIRST — READ BEFORE USE

Before anything else. These rules apply every time you use citronella essential oil.

🔴 FOR EXTERNAL USE ONLY Citronella essential oil is strictly for external application and aromatherapy diffusion. Never ingest citronella oil. Ingestion can cause serious harm, including poisoning. There have been documented cases of poisoning in children who consumed insect repellent products containing citronella oil. Keep all essential oils completely out of reach of children at all times.

🔴 ALWAYS DILUTE — NEVER APPLY NEAT Citronella oil is highly concentrated. Applying undiluted citronella oil directly to skin will cause irritation, redness, rashes, or chemical burns in sensitive individuals. It must always be diluted in a carrier oil (coconut, almond, jojoba) or water-based solution before any skin contact. Minimum dilution: 2% (approximately 12 drops per 30ml of carrier oil). For children and sensitive skin: 0.5–1%.

🔴 DO NOT INHALE DIRECTLY While citronella in a diffuser at the recommended dose is generally safe for aromatherapy, directly inhaling concentrated citronella oil from a bottle or applying it near the nose can cause respiratory irritation and, in severe cases, lung damage. Always use a diffuser with adequate room ventilation. Never apply near the nose or mouth.

🔴 CHILDREN UNDER 6 MONTHS — SKIN APPLICATION NOT RECOMMENDED Do not apply citronella oil (even diluted) to the skin of babies under 6 months. For children between 6 months and 2 years, use the lowest possible dilution (0.5%) and only under parental supervision. Keep the product away from the child's hands, eyes, and mouth at all times.

🔴 PREGNANCY AND BREASTFEEDING There is insufficient safety data on the use of citronella oil during pregnancy and breastfeeding. As a precaution, avoid topical application and direct aromatherapy use during pregnancy. Consult your doctor before using any essential oil during pregnancy or while nursing.

🔴 PATCH TEST BEFORE BROAD APPLICATION Before using citronella oil on your skin for the first time, perform a patch test: apply a small amount of properly diluted oil to the inner forearm, cover loosely, and wait 24 hours. If you notice redness, itching, or swelling, do not use the oil. Discontinue immediately if any irritation develops during use.

🔴 PETS — EXERCISE CAUTION Cats are particularly sensitive to essential oils including citronella. Do not apply citronella products to cats and avoid diffusing in closed rooms where cats are confined. Dogs can tolerate small amounts of diluted citronella topically but ingestion is toxic. Keep all essential oils away from pets.

🔴 CONSULT YOUR DOCTOR if you have asthma, chronic respiratory conditions, severe allergies, sensitive skin conditions (eczema, psoriasis), or if you are taking medications that may interact with topical preparations. This guide is informational and does not constitute medical advice.

What Is Citronella Oil and Where Does It Come From?

Citronella oil is an essential oil steam-distilled from the leaves and stems of citronella grass — a tall, aromatic grass in the Cymbopogon genus (the same genus as lemongrass, though a different species and a distinctly different oil).

Two Varieties — Ceylon and Java

Citronella oil is produced commercially from two species:

Ceylon citronella (Cymbopogon nardus) — the original Sri Lankan variety, with a lighter, more floral citrus scent. Key chemical components: citronellal (5–15%), geraniol (18–20%), citronellol (6–8%), limonene (9–11%).

Java citronella (Cymbopogon winterianus) — the higher-yield commercial variety, with a stronger, more pungent lemon-grass scent and significantly higher citronellal content (32–45%) and geraniol (21–24%). The higher citronellal and geraniol levels make Java type oil more effective as a mosquito repellent and more valuable for perfumery derivatives.

OotyMade sources citronella oil from Tamil Nadu and Kerala producers who cultivate Cymbopogon winterianus — the Java variety — chosen specifically for its higher active compound content.

How It Is Made — Steam Distillation from the Nilgiris Region

The fresh citronella grass is harvested when the citronellal content is at its peak — typically just before flowering. The leaves are loaded into a steam distillation apparatus: pressurised steam passes through the plant material, volatilising the aromatic oil compounds, which then condense and separate from the water as pure essential oil.

The Nilgiris region and its Tamil Nadu foothills have the tropical climate, rainfall, and altitude variation that citronella grass requires: warm, humid growing conditions at lower elevations (400–800 metres) transitioning into the cooler Nilgiris plateau. The grass grown in these conditions produces oil with the high citronellal concentration required for effective mosquito repellent use.

Chemical Composition — Why It Works

The effectiveness of any citronella oil as a repellent is directly linked to its citronellal and geraniol content — which is why knowing the oil's chemotype (Ceylon or Java) and having a quality product with high active compound levels matters for real-world results.

How Citronella Oil Actually Repels Mosquitoes — The Science

Mosquitoes locate human hosts primarily through three sensory signals:

1. Carbon dioxide (CO2) — we exhale it with every breath; mosquitoes detect it from up to 50 metres
2. Lactic acid and other skin volatiles — compounds produced by sweat and skin metabolism
3. Body heat — mosquitoes use infrared sensing at close range

Citronella oil does not kill mosquitoes. It does not create a physical barrier. It works as a masking agent — the strong aromatic compounds (primarily citronellal and geraniol) overwhelm the mosquito's olfactory receptors, making it unable to detect the CO2 and body odour signals that would normally guide it to a host.

Think of it as sensory noise — so loud that the signal (you) cannot be detected through it.

What the research says:

• A 2015 study published in Rural and Remote Health found citronella oil to be an "affordable and effective alternative mosquito repellent" for preventing mosquito-borne diseases in rural areas
• The US Environmental Protection Agency has classified citronella oil as a biopesticide with a non-toxic mode of action since 1948 — one of the longest-registered natural repellents in the world
• Citronella oil is particularly effective against Aedes aegypti — the mosquito that carries dengue fever, chikungunya, Zika virus, and yellow fever
• Protection duration: 1–3 hours at standard dilution (10%). Adding vanillin (vanilla extract) as a synergist extends protection to 2–3 hours. Reapplication is required for continuous outdoor protection

Honest limitation: Citronella oil is not as long-lasting as DEET (which provides 4–8 hours of protection per application). The trade-off is a non-toxic, plant-based ingredient with no systemic chemical absorption. For extended outdoor stays, reapply every 2 hours.

8 Proven Benefits of Citronella Oil

1. Natural Mosquito and Insect Repellent

The primary use, supported by the strongest evidence. Apply properly diluted citronella oil to exposed skin and clothing before outdoor activities — evening garden time, trekking, outdoor dining, camping. Citronella repels not only mosquitoes but also flies, gnats, fleas, body lice, and head lice.

For the Nilgiris context: The Nilgiris and its surrounding districts are in a dengue-endemic zone. The evening hours (5–8 PM) when mosquitoes are most active coincide exactly with when Nilgiris residents sit outdoors for evening tea. Citronella oil applied before 5 PM outdoor time is a practical, chemical-free alternative to synthetic repellent creams that have DEET and permethrin as active ingredients.

2. Antifungal Action — Skin and Scalp Infections

Citronellal and geraniol have documented antifungal activity — they disrupt fungal cell membranes, inhibiting the growth of species including Candida albicans (the fungus responsible for oral thrush, vaginal yeast infections, and some skin rashes) and the dermatophytes that cause athlete's foot and ringworm.

Application for skin fungal issues: Dilute 3–4 drops citronella oil in 1 teaspoon of coconut oil. Apply to the affected area twice daily. For foot fungal infections (athlete's foot, between toes): apply at bedtime, wear cotton socks overnight.

⚠️ Fungal infections that do not improve within 2 weeks of topical natural treatment, or that spread, should be evaluated by a dermatologist. Persistent or widespread fungal infection requires prescription antifungal medication.

3. Antibacterial — Body Odour and Minor Skin Infections

Citronella oil has demonstrated antibacterial properties against a range of common skin bacteria, including Staphylococcus aureus. Its strong, clean citrus fragrance also makes it an effective natural deodorant — masking body odour while simultaneously reducing the bacterial activity on skin that causes odour.

Application:

• Add 1–2 drops to your body wash or shower gel
• Add 3 drops to 50ml of water in a small spray bottle as a body spray for light deodorant effect (shake vigorously before each use — oil and water separate)
• For minor skin infections or insect bite secondary infections: apply 1 drop diluted in 4 drops carrier oil to the affected area twice daily

4. Anti-inflammatory — Insect Bite Relief and Joint Discomfort

The citronellol and borneol compounds in citronella oil have anti-inflammatory properties that reduce the redness, swelling, and itching of insect bites — directly relevant given its use as a repellent (you can both prevent bites and treat the ones that get through).

For general joint and muscle anti-inflammatory use, citronella oil works well in a massage blend — combine with gaultheria oil (the primary pain-relief oil) for an effective joint care blend.

For insect bite relief: Apply 1 drop citronella oil diluted in 3 drops almond or coconut oil directly to the bite. The anti-inflammatory action reduces the histamine-triggered swelling and the antibacterial component prevents secondary infection from scratching.

5. Aromatherapy — Mood Elevation and Stress Relief

The fresh, uplifting citrus-green scent of citronella oil has measurable effects on mood and stress response when diffused at appropriate concentrations. The limonene component has been studied for its anxiolytic (anti-anxiety) effects in aromatherapy research. The overall scent profile of citronella — bright, clean, energising — is associated with the limbic system responses that produce alertness and positive affect.

Diffusion protocol: 3–5 drops in a standard 100–200ml electric diffuser with water. Run for 30–60 minutes, then ventilate the room. Do not run continuously for more than 1 hour. Ensure good room ventilation. Do not use near infants under 6 months.

Blend suggestion for uplift and mental clarity:

• 3 drops citronella oil
• 2 drops lemongrass oil
• 2 drops peppermint oil

This combination in a diffuser is particularly effective in the late afternoon slump — the citrus-fresh combination creates an alerting effect without the stimulant side effects of caffeine.

6. Hair Care — Scalp Health and Dandruff Control

The antifungal properties of citronella oil make it effective for the fungal component of dandruff (Malassezia species are implicated in seborrhoeic dandruff). The astringent quality of geraniol also helps regulate excess scalp oil production, which creates the environment in which dandruff fungi thrive.

Application: Add 3–4 drops of citronella oil to 2 tablespoons of your regular hair oil (coconut or almond). Massage into scalp. Leave for 30 minutes before washing. Use twice weekly for 4–6 weeks for dandruff treatment.

For hair with lice: citronella oil has documented repellent activity against head lice. Add 5 drops to your shampoo and leave for 3 minutes before rinsing, as a preventive measure during lice outbreaks at school.

7. Home Insect Deterrent and Surface Cleaner

Beyond personal repellent use, citronella oil's strong aromatic compounds deter insects from entering living spaces. The limonene component also has natural cleaning properties, cutting grease and neutralising odours.

Room spray: Mix 20 drops citronella oil + 10 drops lemongrass oil + 1 tablespoon rubbing alcohol + 200ml water in a spray bottle. Shake before each use. Spray around doorways, window sills, and curtains at dusk. Reapply daily during peak mosquito season.

Surface cleaning: Add 5–8 drops to a bucket of mopping water. Cleans surfaces while deterring ants and insects. Particularly effective for kitchen floors where food residue attracts pests.

Linen freshener: Place 2–3 drops on a cotton wool ball and put inside wardrobes or drawers. Deters moths and keeps linen smelling clean.

8. Oily Skin and Acne Control

Geraniol and citronellal have mild astringent and sebum-regulating properties — they tighten pores and reduce excess oil production on the skin surface. For oily skin types that are prone to acne and enlarged pores, citronella oil as part of a toner or face wash blend can visibly improve skin clarity over 3–4 weeks.

⚠️ The face is more sensitive than body skin. Keep facial dilution at 0.5–1% (3–5 drops per 30ml carrier). Do not apply near the eyes, nostrils, or lips. Discontinue if any irritation occurs.

5 DIY Recipes Using Nilgiris Citronella Oil

Recipe 1 — Classic Natural Mosquito Repellent Spray

This is the recipe residents in the Nilgiris have used for generations — before commercial DEET products were available, citronella-based sprays were the standard evening protection.

Ingredients:

• 100ml distilled water (cooled boiled water works)
• 1 tablespoon rubbing alcohol or vodka (emulsifier — helps oil and water mix)
• 15 drops citronella oil
• 10 drops lemongrass essential oil
• 5 drops eucalyptus essential oil

Method: Combine alcohol and essential oils first. Shake for 30 seconds. Add water. Transfer to a dark glass spray bottle. Shake vigorously before every use.

Application: Spray on exposed skin (arms, legs, neck), on clothing (especially ankles and wrists), and on fabric surfaces (chair cushions, mosquito nets). Reapply every 1.5–2 hours outdoors.

Safe for: Adults and children over 2 years. For children 6 months–2 years, halve the drops of essential oil.

Not for: Children under 6 months. Pregnant or breastfeeding women without doctor advice. Direct spraying on the face — spray on hands and pat onto face away from eyes and mouth.

Shelf life: 4–6 weeks. Store in a cool, dark place. The alcohol prevents microbial growth in the water phase.

Recipe 2 — Monsoon Season Body Protection Oil

For the Nilgiris and South India generally, the monsoon season (July–September) is peak mosquito season — standing water breeds Aedes and Anopheles mosquitoes in large numbers. This body oil is applied before outdoor exposure.

Ingredients:

• 30ml cold-pressed almond oil (carrier)
• 10 drops citronella oil
• 8 drops lemongrass oil
• 5 drops peppermint oil
• 3 drops tea tree oil (added antibacterial — for bite prevention and healing)

Method: Combine all ingredients in a 30ml dark glass roller bottle or dropper bottle. Roll or pat onto arms, legs, and neck. Massage in gently.

Why this blend works: Citronella and lemongrass provide the repellent barrier. Peppermint's menthol extends the volatile compound release and adds a cooling sensation. Tea tree provides backup antibacterial action on any bites that do occur. Almond oil as carrier absorbs well and does not feel heavy.

Reapplication: Every 2 hours outdoors. After swimming or heavy sweating — reapply immediately.

Recipe 3 — DIY Citronella Room Diffuser Blend

For indoor protection during evening hours without spraying the room.

Ingredients (for diffuser):

• 4 drops citronella oil
• 3 drops lemongrass oil
• 2 drops rosemary essential oil

Method: Add to a standard 100–200ml electric ultrasonic diffuser with water. Run for 45–60 minutes before peak mosquito hours (start around 4:30–5 PM). Ventilate the room afterward.

For reed diffusers:

• 80ml carrier oil (fractionated coconut oil or almond oil)
• 20ml rubbing alcohol
• 30 drops citronella oil
• 20 drops lemongrass oil Combine in a reed diffuser bottle with 5–6 rattan reeds. Place in the room. Flip reeds every 3–4 days. Refill monthly.

⚠️ Diffuser safety: Do not run diffusers in rooms where babies under 6 months are sleeping. Run in ventilated spaces. Turn off and ventilate every hour. Do not diffuse for extended continuous periods.

Recipe 4 — Anti-Dandruff Scalp Treatment Oil

Ingredients:

• 3 tablespoons coconut oil
• 5 drops citronella oil
• 4 drops rosemary essential oil
• 3 drops tea tree oil

Method: Warm the coconut oil until just liquid. Add essential oils. Apply to scalp, sectioning hair for thorough coverage. Massage for 5 minutes in circular motions. Cover with a warm towel for 30 minutes. Wash out thoroughly — may require two rounds of shampoo.

Use: Twice weekly for active dandruff. Once weekly for maintenance.

Why this combination: Citronella targets the Malassezia fungi responsible for dandruff. Rosemary stimulates scalp circulation. Tea tree provides broad-spectrum antimicrobial activity. Coconut oil (a natural antifungal) provides the penetrating carrier.

Expect results in: 3–4 weeks of consistent use.

Recipe 5 — Natural Linen and Fabric Spray

Freshen stored clothes, deter moths, and keep bedding smelling clean without synthetic fragrance chemicals.

Ingredients:

• 200ml distilled water
• 2 tablespoons rubbing alcohol
• 15 drops citronella oil
• 10 drops lavender essential oil
• 5 drops camphor oil (traditional moth deterrent)

Method: Combine alcohol and oils first. Add water. Transfer to spray bottle. Shake before each use.

Application: Spray lightly on folded clothes before storage, inside wardrobes, on mattresses, curtains, and mosquito nets. Allow fabric to dry completely before folding.

Moths hate: camphor, citronella, and lavender — all three together create an extremely effective natural deterrent for stored fabric pests.

⚠️ Do not spray directly on delicate fabrics (silk, cashmere) without testing on a small area first. The alcohol base can affect some dyes.

Citronella vs. Lemongrass Oil — What Is the Difference?

This is one of the most common questions about citronella oil. They are related but not the same.

They are often confused because both belong to the Cymbopogon genus and both grow in the same regions. For mosquito repellent, citronella is the primary oil. For muscle soreness and stress relief, lemongrass is the primary oil. Combined in a blend, they are more effective as a repellent than either alone.

The OotyMade Nilgiris Citronella Difference

Most commercial citronella oil sold in India is processed at bulk industrial facilities using solvent extraction rather than steam distillation, or is steam-distilled but blended with carrier oil to reduce cost. The result is an oil with lower citronellal concentration — less effective as a repellent, less aromatic, less therapeutically active.

OotyMade's citronella oil is:

Steam-distilled from Cymbopogon winterianus (Java type) grown in the Tamil Nadu foothills — the high-citronellal variety chosen specifically for repellent and therapeutic effectiveness.

Undiluted — no carrier oil added, no synthetic fragrance to simulate the aroma of a more concentrated oil. The scent is strong and immediately noticeable, which is how you can verify purity: pure citronella oil has a sharp, powerful citrus-grass smell. If your citronella oil has a faint or thin scent, it has been diluted.

Packed in amber glass — UV light degrades the citronellal content that makes the oil effective. Clear glass bottles allow light degradation. Amber glass protects the active compounds.

Buy Pure Nilgiris Citronella Oil from OotyMade →

How to Store Citronella Oil

• Store in a cool, dark place — away from direct sunlight, heat sources, and humidity
• Keep in the original amber glass bottle — do not transfer to plastic (essential oils can dissolve plasticisers from plastic containers over time)
• Keep lid tightly closed — citronellal is volatile and evaporates if exposed to air
• Shelf life: 2–3 years from distillation date when stored correctly
• Signs of degradation: The sharp citrus-lemon scent weakens significantly; the oil may darken slightly. Degraded oil loses repellent effectiveness.
• Never store near flames — essential oils are flammable

Frequently Asked Questions

Does citronella oil actually work to repel mosquitoes? Yes — with an important qualification. Citronella oil is a scientifically documented mosquito repellent, registered as a biopesticide with the US EPA since 1948. It effectively repels Aedes aegypti (dengue, Zika, chikungunya mosquitoes) for 1–3 hours per application. It is not as long-lasting as DEET-based repellents. For outdoor settings requiring extended protection, reapply every 1.5–2 hours and consider adding vanillin (vanilla extract) to your spray blend, which has been shown to extend protection duration.

Is citronella oil safe for children? Citronella oil is not recommended for children under 6 months in any form of skin application. For children aged 6 months to 2 years, use at a very low dilution (0.5%) and only under parental supervision. For children over 2 years, the standard low dilution (1%) is generally considered safe for skin application. Never allow children to handle essential oil bottles. Keep all essential oils stored out of reach of children in a locked or high cupboard. If a child accidentally ingests any citronella product, contact the Poison Control helpline immediately.

Can I use citronella oil during pregnancy? There is insufficient safety research on citronella oil use during pregnancy and breastfeeding. As a precautionary measure, avoid topical application and aromatherapy use during pregnancy. For mosquito protection during pregnancy, use physical barriers (mosquito nets, long-sleeved clothing) and consult your gynaecologist or doctor for safe repellent options appropriate for pregnancy. Always consult your doctor before using any essential oil during pregnancy.

What is the difference between citronella oil and citronella candles? Citronella candles — wax candles with citronella oil added — are popular but significantly less effective than direct skin application or diffuser use. The concentration of citronellal released from a burning candle is much lower than direct application. According to the American Mosquito Control Association, citronella candles provide only about 50% protection in outdoor settings. They can contribute to a general deterrent effect in an enclosed outdoor area but should not be relied on as primary protection. Use skin application as your primary method; candles as supplementary.

Can I use citronella oil on my dog or cat? Do not use any citronella oil products on cats — cats lack the liver enzyme (glucuronyl transferase) that metabolises terpene compounds, making many essential oils including citronella toxic to them. For dogs, very diluted topical application is sometimes used but there is limited safety data. Ingestion of citronella oil is toxic to dogs. Do not diffuse citronella oil in rooms where cats are present. Consult a veterinarian before using any essential oil around or on pets.

How do I know if my citronella oil is pure and not diluted? Three tests: (1) Scent test — pure high-quality citronella oil has a sharp, powerful, distinctly lemon-grass smell that is immediately noticeable. Diluted oil has a faint or thin scent. (2) Paper test — place one drop on white paper and let it dry. Pure essential oil will evaporate leaving minimal residue. Carrier oil residue (a greasy translucent circle) indicates the oil has been diluted with a carrier. (3) Source verification — buy from a supplier who can provide the botanical name (Cymbopogon winterianus or Cymbopogon nardus) and country of origin on the label. OotyMade's citronella oil sourcing details are available on request.

Can citronella oil be used indoors every day? Citronella oil can be diffused indoors daily for short periods (30–60 minutes at a time) in well-ventilated rooms. Continuous diffusion for hours is not recommended — it can cause headaches and respiratory irritation in sensitive individuals. The 30-minute diffusion period before peak mosquito hours (evening) is the most practical approach — enough to deter insects entering the room, not enough to cause irritation. Always ventilate after diffusing.

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Disclaimer: This blog post is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Essential oils are not medicines and are not substitutes for professional medical care. Always consult a qualified healthcare provider before using essential oils if you have any medical conditions, are pregnant or breastfeeding, are treating children, or are taking any medications. OotyMade's essential oils are for external use and aromatherapy only — not for internal consumption.

OotyMade.com — Pure essential oils steam-distilled from Nilgiris cultivators. DPIIT Startup India recognised. Dispatched within 48 hours. Free delivery above ₹500 across India.