Lemongrass
Lemongrass is a tropical aromatic grass used widely in culinary traditions and studied for its essential oil composition and bioactive compound profile.
Overview
Lemongrass refers to several species within the Cymbopogon genus — most commonly Cymbopogon citratus (West Indian lemongrass) and Cymbopogon flexuosus (East Indian lemongrass) — tall, aromatic tropical grasses prized for their distinctive citrus-like fragrance and flavor. As a culinary ingredient, lemongrass is a foundational element in Southeast Asian cooking, appearing in Thai, Vietnamese, Indonesian, and Malaysian cuisines with a frequency that makes it nearly invisible as a "special" ingredient in those food cultures. Its presence in the Western wellness and supplement market, by contrast, frames it primarily through the lens of its essential oil — a concentrated volatile extract whose properties have attracted modest research interest.
The distinction between lemongrass as a food ingredient and lemongrass essential oil as a concentrated botanical product is significant and often blurred in popular wellness discussions. A stalk of lemongrass simmered in a curry represents a fundamentally different exposure than applying undiluted essential oil to skin or ingesting essential oil preparations. This page provides educational context about lemongrass in both its culinary and botanical extract forms, its traditional background, and the current state of research.
What it is
Lemongrass is a perennial tropical grass that can grow over a meter tall, forming dense clumps in warm, humid climates. The plant's aroma and flavor derive primarily from citral, a mixture of the isomers geranial and neral, which constitutes the dominant component of lemongrass essential oil. Other volatile compounds — including myrcene, limonene, and geraniol — contribute to the overall chemical profile, though their proportions vary with species, growing conditions, harvest timing, and distillation methods. Fresh lemongrass stalks, dried lemongrass, lemongrass powder, lemongrass tea (herbal infusion), and steam-distilled essential oil are all commercially available forms, each representing a different concentration and composition of the plant's bioactive compounds.
The culinary form — fresh or dried stalks — delivers aromatic compounds in trace quantities within a food matrix, alongside fiber and small amounts of minerals. Lemongrass tea, made by steeping fresh or dried leaves and stalks in hot water, provides a more concentrated aromatic experience than culinary use but substantially less than essential oil. The essential oil itself is a highly concentrated distillate used in aromatherapy, topical products, cleaning formulations, and insect repellent applications. Conflating these very different forms is a common source of misunderstanding in consumer wellness contexts.
Traditional use (educational)
Lemongrass has deep roots in the culinary and folk traditions of South and Southeast Asia, where it has served both as a daily cooking ingredient and as a traditional preparation in multiple cultural health systems. In Thai and Vietnamese cuisines, lemongrass stalks are used fresh in soups, curries, stir-fries, and salads — valued for their bright, citrusy flavor and aromatic complexity. Indonesian and Malaysian food traditions incorporate lemongrass similarly, often as part of aromatic paste blends (bumbu or rempah) that form the flavor foundation of regional dishes.
Beyond the kitchen, lemongrass appears in traditional folk preparations across multiple tropical regions. In parts of West Africa and the Caribbean — where the plant was introduced through colonial-era botanical exchange — lemongrass tea has been consumed as a common household beverage, often associated with digestive comfort and relaxation in local folk traditions. Indian Ayurvedic and folk medicine traditions reference lemongrass-type grasses in various herbal contexts, though the specific species and applications differ from those found in Southeast Asian traditions. Brazilian folk herbalism also incorporates lemongrass tea (known locally as capim-limão or capim-cidreira) as one of the most commonly consumed herbal infusions in the country. These diverse traditional uses reflect the plant's wide geographic distribution and cultural adaptability rather than any validated therapeutic application.
What research says
The research literature on lemongrass is modest compared to more heavily studied botanicals like turmeric or green tea. Much of the published work focuses on the essential oil rather than culinary or tea preparations, and a substantial proportion consists of in vitro (cell-based) and animal model studies. Laboratory work has examined citral and other volatile compounds for their interactions with bacterial cultures, fungal organisms, and isolated cell lines. These findings, while contributing to basic scientific understanding of the compounds' chemical behavior, do not translate directly to conclusions about what happens when a person drinks lemongrass tea or applies a diluted essential oil topically.
Human clinical data on lemongrass is sparse. A small number of preliminary trials have explored lemongrass tea or oil in the context of physiological markers like blood pressure readings and anxiety-related survey outcomes, but these studies are typically small, short-term, and lacking the methodological rigor needed for reliable conclusions. The absence of large, well-controlled clinical trials is a defining feature of the lemongrass evidence landscape. Major institutional reference sources do not generally provide specific monographs on lemongrass, which itself reflects the compound's relatively low priority in the hierarchy of research-supported botanicals. Claims encountered in wellness media — attributing wide-ranging properties to lemongrass — consistently outpace what the published evidence actually supports.
A distinct area of applied research involves lemongrass oil's use as an insect repellent component, particularly against mosquitoes. This application has a more established practical basis than many wellness-oriented claims, though the duration and reliability of repellent effects vary across formulations and environmental conditions. The distinction between a demonstrated insect-repellent function and broader health claims is worth maintaining.
Safety & interactions
Lemongrass consumed as a culinary ingredient or as a mild herbal tea is generally considered well-tolerated by most people. The safety literature for these forms is limited primarily because they represent such routine, low-concentration exposures that formal safety studies are uncommon. Allergic reactions to lemongrass are possible but appear to be rare in published reports; individuals with known grass allergies may have a heightened sensitivity, though cross-reactivity patterns are not well characterized.
Lemongrass essential oil, as a concentrated volatile extract, carries a different safety profile. Undiluted topical application can cause skin irritation or contact sensitization in susceptible individuals, and citral — the dominant compound — is recognized in dermatological literature as a potential skin sensitizer at higher concentrations. Ingestion of essential oils is a broader safety concern that applies across many botanical essential oils, not just lemongrass; essential oils are highly concentrated chemical mixtures not designed for internal consumption, and gastrointestinal irritation is a well-documented risk. Drug interaction data specific to lemongrass is very limited, and no well-characterized pharmaceutical interactions have been established, though the general principle of exercising caution when combining concentrated botanical products with medications applies.
Who should be cautious
Pregnant and breastfeeding individuals are commonly advised to exercise caution with lemongrass essential oil, as safety data for these populations is insufficient. Culinary use of lemongrass stalks during pregnancy is generally not flagged as a specific concern in major reference materials, but concentrated essential oil or supplement forms represent a different level of exposure. Individuals with grass pollen allergies may wish to be attentive to any reactions when first encountering lemongrass, though reliable cross-reactivity data is sparse.
People with sensitive skin should approach topical lemongrass essential oil products with awareness of potential irritation, particularly products with higher essential oil concentrations or those applied to areas of already-compromised skin. Individuals taking medications metabolized through cytochrome P450 pathways should be generally cautious with concentrated botanical products, though specific interaction data for lemongrass is not well established. Children and infants represent a population where undiluted essential oil application is particularly inadvisable, given their thinner skin and generally lower tolerance for concentrated volatile compounds.
Quality & sourcing considerations
Lemongrass quality varies depending on the form and intended use. For culinary purposes, fresh lemongrass stalks are widely available in Asian grocery stores and in many mainstream supermarkets; freshness and storage conditions are the primary quality variables. Dried lemongrass and lemongrass tea products vary in aromatic intensity depending on drying method, storage duration, and packaging — exposure to heat and light degrades the volatile compounds that define the herb's character.
For essential oil products, quality variability is more consequential. The species used (C. citratus versus C. flexuosus versus other Cymbopogon species), the plant part distilled, the distillation method, and storage conditions all affect the chemical composition of the final product. Adulteration with synthetic citral or cheaper essential oils is a documented concern in the aromatherapy supply chain. Gas chromatography-mass spectrometry (GC-MS) testing reports — sometimes provided by reputable essential oil suppliers — offer a window into product composition, though interpreting these reports requires specialized knowledge. Third-party testing and supplier transparency are relevant considerations for anyone selecting lemongrass essential oil products for any purpose.
FAQs
Is lemongrass tea the same as lemongrass essential oil? No. Lemongrass tea is a mild herbal infusion made by steeping fresh or dried lemongrass in hot water. Lemongrass essential oil is a highly concentrated steam-distilled extract containing volatile compounds at much higher concentrations than tea. The two represent fundamentally different types of exposure, and safety considerations that apply to essential oil do not necessarily apply to tea, and vice versa.
Can lemongrass be used topically? Diluted lemongrass essential oil is found in many topical products, including massage oils, lotions, and insect repellent formulations. Undiluted essential oil may cause skin irritation in some individuals. Patch testing on a small area of skin before broader application is a common practical suggestion in aromatherapy literature.
What gives lemongrass its distinctive smell? The characteristic citrus-like aroma of lemongrass comes primarily from citral, a naturally occurring compound that exists as a mixture of two chemical isomers (geranial and neral). Citral typically makes up a large proportion of lemongrass essential oil, though other volatile compounds contribute to the overall aromatic complexity.
Is lemongrass related to lemons? Despite the name and overlapping aromatic qualities, lemongrass is not botanically related to lemons. Lemongrass belongs to the grass family (Poaceae) and the genus Cymbopogon, while lemons are citrus fruits in the family Rutaceae. The similar aroma arises because both produce citral and related terpene compounds through unrelated biochemical pathways — an example of convergent chemistry rather than shared ancestry.
Does cooking with lemongrass provide the same effects as taking a supplement? Culinary use of lemongrass delivers aromatic and flavor compounds in small quantities within a complex food matrix. Concentrated lemongrass supplements or essential oil products deliver different compounds in much higher concentrations. These represent distinct types of exposure, and research findings from one form should not be assumed to apply to another.