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Lemongrass essential oil is one of the most recognisable aromas in natural wellness, its bright, clean, citrus-herbal scent is distinct and instantly familiar. But beyond the aroma, lemongrass oil has a well-documented biochemical profile that explains why it has been used in Ayurvedic and traditional Asian medicine for centuries. Its primary compound, citral, is one of the most studied antimicrobial and anti-inflammatory compounds in the essential oil world, and the research confirms many of the traditional applications that have guided its use for generations.

This article covers what lemongrass oil genuinely does, what the clinical evidence specifically shows, and how to use it correctly for hair, skin, and wellbeing applications.

What is lemongrass oil and what does it contain?

Lemongrass essential oil is produced by steam distillation of the leaves and stalks of Cymbopogon citratus, a species of lemongrass native to South Asia and widely grown across tropical regions globally. The distillation process extracts a pale to bright yellow oil with a thin consistency and an intensely fresh, citrus-herbal aroma. The quality and therapeutic potency of the oil varies significantly by botanical species, geographic origin, harvest season, and distillation method.

Lemongrass oil benefits for hair and scalp

Dandruff treatment, strongest hair evidence. Lemongrass oil's antifungal activity against Malassezia, the yeast responsible for dandruff, is well-documented in the research. A clinical study found that a hair tonic containing lemongrass oil applied to the scalp significantly reduced dandruff scores after one and two weeks of use compared to a placebo. The mechanism is citral's disruption of fungal cell membranes, the same broad antifungal mechanism that makes lemongrass effective against Candida and dermatophytes. For a complete guide to natural dandruff treatments including lemongrass oil, read our DIY anti-dandruff hair mask guide.

Scalp cleansing and sebum regulation. Citral has natural astringent properties that help remove accumulated sebum, product buildup, and environmental debris from the scalp. For people with oily scalps prone to buildup between washes, a few drops of lemongrass oil in a carrier oil applied before shampooing helps dissolve excess sebum and creates a cleaner follicle environment. The antimicrobial action simultaneously reduces the bacterial and fungal load that contributes to scalp odour and folliculitis.

Scalp inflammation reduction. The 2024 study confirming lemongrass oil's anti-inflammatory effects, through reduction of proinflammatory cytokines TNF-alpha and IL-6, is directly relevant to scalp health. Chronic scalp inflammation impairs hair follicle function, disrupts the hair growth cycle, and creates the irritated, itchy scalp environment that worsens dandruff and contributes to diffuse hair thinning. Lemongrass oil's anti-inflammatory action addresses this scalp environment issue, not by directly stimulating follicles, but by reducing the inflammatory conditions that suppress normal hair cycling.

What lemongrass oil does not do for hair. Lemongrass oil does not directly stimulate hair follicles in the way rosemary oil's rosmarinic acid inhibits 5-alpha reductase, or peppermint oil's menthol increases scalp blood flow. It is a scalp health and antimicrobial ingredient rather than a direct hair growth stimulant. For people whose hair thinning is partly driven by scalp inflammation or dandruff, lemongrass oil addresses a genuine contributing factor, but for androgenetic alopecia or other primary hair loss conditions, it should be combined with more directly targeted ingredients.

Lemongrass oil benefits for skin

Antimicrobial and acne support. Citral in lemongrass oil has broad-spectrum antibacterial activity, including against Cutibacterium acnes, the primary bacteria responsible for acne. The 2024 scoping review confirmed antimicrobial activity including against drug-resistant bacterial strains and biofilms. At appropriate dilution (1-2% in a carrier oil), lemongrass oil applied as a spot treatment can reduce acne-causing bacteria on the skin surface. It is less directly potent than tea tree oil for acne, tea tree's terpinen-4-ol has stronger targeted antimicrobial data against acne bacteria, but lemongrass combines antimicrobial action with pore-tightening astringency that tea tree lacks.

Pore tightening and skin cleansing. Citral's astringent properties temporarily tighten pores, reduce excess sebum production at the skin surface, and create a cleaner, more refined skin texture. This is particularly relevant for oily or combination skin types where enlarged pores and surface shine are primary concerns. The effect is temporary rather than permanent, regular use maintains the benefit but stopping use allows sebum and pore size to return to baseline.

Antioxidant protection. Lemongrass oil has documented antioxidant activity, citral scavenges free radicals generated by UV exposure and environmental pollution that drive skin ageing, hyperpigmentation, and barrier damage. Used as a component of a facial oil blend applied in the evening, lemongrass contributes antioxidant protection to the skin's overnight repair process. The antioxidant activity is meaningful but not as potent as dedicated antioxidant actives like Vitamin C or ferulic acid, lemongrass is best understood as a complementary antioxidant rather than a primary anti-ageing ingredient.

Soothing inflammatory skin conditions. The 2024 study specifically highlighted lemongrass oil's potential for inflammatory skin conditions, its reduction of proinflammatory cytokines is relevant for conditions like rosacea and scalp inflammation where cytokine-driven inflammatory cascades drive the visible symptoms. Diluted lemongrass oil in a carrier applied to affected areas can reduce redness and soothe irritation, though people with rosacea should patch test carefully given citral's sensitisation potential at higher concentrations.

Other uses, aromatherapy, insect repellent, and deodorising

Aromatherapy for anxiety and stress. A clinical study published in the Journal of Alternative and Complementary Medicine found that inhalation of lemongrass oil produced a significant decrease in anxiety and subjective tension compared to controls when subjects were exposed to an anxiety-inducing situation. The mechanism is thought to involve citral's interaction with GABA receptors in the central nervous system, the same receptors targeted by many anti-anxiety medications, though through a much gentler pathway. Diffusing lemongrass oil in a room or adding 3-5 drops to a personal inhaler is one of the more evidence-supported aromatherapy applications for situational anxiety and stress management.

Natural insect repellent. Citral and citronellal in lemongrass oil have documented repellent activity against mosquitoes, the same reason citronella (a related plant) is widely used in natural insect repellents. Lemongrass oil diluted in a carrier oil and applied to exposed skin provides natural mosquito repellent activity. The duration of protection is shorter than synthetic DEET-based repellents (approximately 2 hours vs 4-6 hours), reapplication is needed for extended outdoor exposure.

Natural deodoriser. Citral's broad-spectrum antimicrobial activity directly addresses body odour, which is caused by bacteria metabolising sweat on the skin surface rather than by sweat itself. Lemongrass oil in a carrier applied to pulse points or underarms reduces the bacterial population responsible for odour while providing a pleasant natural fragrance. It is not an antiperspirant, it does not reduce sweating, but it effectively manages the bacterial cause of odour.

How to use lemongrass oil, dilution guide and recipes

Safety, side effects, and who should avoid it

Always dilute, citral sensitisation is the primary risk. Lemongrass oil's high citral content (70-80%) makes it one of the more potent essential oils for potential skin sensitisation. Citral is a known allergen at higher concentrations, undiluted or poorly diluted lemongrass oil applied to skin can cause contact dermatitis, redness, and chemical irritation. Always dilute to 1% or below for face applications and 2-3% for body and scalp applications. Never apply undiluted to skin under any circumstances.

Patch test before first use. Apply a small amount of your diluted blend to the inner forearm. Wait 24 hours. Any redness, itching, or swelling means lemongrass oil is not appropriate for your skin type at that concentration, reduce the concentration further or discontinue. Patch testing is particularly important for people who have experienced reactions to citrus-derived products or other high-citral essential oils.

Sensitive skin, use with caution. People with eczema, rosacea, or known fragrance sensitivity should use lemongrass oil at very low concentrations (0.5% or below) or avoid it entirely. The citral content that makes it effective is also the component most likely to trigger reactions in compromised or highly sensitive skin.

Pregnancy and children. Lemongrass oil should not be used during pregnancy and is not recommended for children under 10. The citral content and potential hormonal interactions make standard precautionary avoidance appropriate for both groups.

Storage matters. Citral oxidises when exposed to heat, light, and air. Oxidised lemongrass oil loses potency and increases its irritation and sensitisation potential significantly. Store in a dark glass bottle in a cool location, ensure the cap is tightly sealed after each use, and discard after 2-3 years of opening. If the aroma has shifted from fresh and bright to flat or musty, the oil has likely oxidised.

Frequently asked questions

The bottom line

Lemongrass essential oil is one of the most versatile and well-evidenced essential oils available, its high citral content delivers genuine antimicrobial, antifungal, anti-inflammatory, and antioxidant benefits that are supported by both traditional use and modern clinical research. The 2024 scoping review and 2024 anti-inflammatory study confirm its therapeutic potential across multiple applications, including dandruff, inflammatory skin conditions, antimicrobial skin care, and anxiety management through aromatherapy.

The critical variable is dilution. Lemongrass oil's potency, which is the source of its effectiveness, also makes it the essential oil that most commonly causes reactions when misused. At correct dilution (1% for face, 2-3% for body and scalp), with a patch test, and stored correctly in a dark glass bottle, it is safe and effective across all its documented applications.