Hermetica Superfood Encyclopedia
The Short Answer
Lemongrass (Cymbopogon citratus) contains citral as its primary bioactive compound, comprising 65-85% of the essential oil. Clinical studies demonstrate its ability to reduce blood pressure and anxiety through GABA receptor modulation and inhibition of inflammatory mediators like nitric oxide.
CategoryHerbs (Global Traditional)
GroupSoutheast Asian
Evidence LevelModerate
Primary Keywordlemongrass benefits
Synergy Pairings3
Serai (Cymbopogon citratus) — botanical close-up
Health Benefits
Origin & History
Natural habitat
Serai (Cymbopogon citratus), commonly known as lemongrass, is a tropical perennial grass native to Sri Lanka and southern India, now widely cultivated across Southeast Asia, Africa, and South America. The aromatic leaves and stems are processed through hot water infusion, aqueous extraction, hydroethanolic extraction, or steam distillation to produce therapeutic extracts and essential oils rich in monoterpenes and flavonoids.
“Lemongrass has been used for centuries in Brazilian herbal medicine as a CNS-depressant, digestive aid, and treatment for diarrhea, fever, and inflammation. It features prominently in Ayurvedic, African, and Southeast Asian traditional medicine systems for antidiarrheal, antifungal, antimalarial, and hypoglycemic applications, with historical use dating back millennia in tropical regions.”Traditional Medicine
Scientific Research
Human clinical evidence remains limited, with one RCT (n=66 surgical patients) demonstrating aromatherapy benefits for anxiety and cardiovascular parameters. Most research consists of preclinical animal models, particularly a PCOS rat study (n=54) showing hormonal modulation, and in vitro anticancer assays. No PMIDs were provided in the research dossier for the identified studies.
Preparation & Dosage
Traditional preparation
Human aromatherapy: Essential oil via inhalation (concentration not specified). Animal studies: Aqueous extract 100-400 mg/kg/day or hydroethanolic extract 100-200 mg/kg/day orally for 28 days. In vitro anticancer: 23-100 µg/mL essential oil. No standardized human oral dosages established. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
Serai (lemongrass) is a low-calorie herb (~99 kcal/100g dry weight) primarily used in small culinary quantities. Macronutrients per 100g fresh: carbohydrates ~25g, protein ~1.8g, fat ~0.5g, dietary fiber ~0.5g. Key micronutrients: potassium ~723mg/100g (significant contributor), magnesium ~60mg/100g, calcium ~65mg/100g, iron ~8.2mg/100g (notable but non-heme form with limited bioavailability ~5-12% without vitamin C co-consumption), zinc ~2.2mg/100g, manganese ~5.2mg/100g. Vitamins: folate ~75mcg/100g, vitamin C ~2.6mg/100g, vitamin A ~6mcg RAE/100g, niacin ~1.1mg/100g. Primary bioactive compounds: essential oil fraction (0.2–0.5% fresh weight) dominated by citral (geranial + neral, comprising 65–85% of essential oil), myrcene (~12%), limonene (~3%), linalool (~1%), and geraniol (~3%). Polyphenolic fraction includes chlorogenic acid, isoorientin, swertiajaponin, and luteolin glycosides at ~15–30mg/100g fresh weight total. Citral is the principal bioactive compound responsible for antimicrobial, anti-inflammatory, and anxiolytic effects; bioavailability of citral via dietary route is moderate (~40–60% absorption) but significantly enhanced via aromatherapy inhalation route due to direct mucosal absorption. Fiber content is primarily insoluble cellulose from fibrous stalks; typically the outer stalks are discarded, so actual nutrient intake per culinary serving (~5–10g fresh) is modest. Mineral bioavailability is reduced by moderate oxalate content (~50mg/100g).
How It Works
Mechanism of Action
Lemongrass essential oil rich in citral (geranial and neral) modulates GABA neurotransmitter activity to reduce anxiety and lower blood pressure. The polyphenolic compounds inhibit lipopolysaccharide-induced nitric oxide production by suppressing inducible nitric oxide synthase (iNOS) protein expression in immune cells. Citral also demonstrates anti-inflammatory activity by blocking nuclear factor-kappa B (NF-κB) signaling pathways.
Clinical Evidence
A randomized controlled trial with 66 surgical patients showed lemongrass aromatherapy significantly reduced both systolic and diastolic blood pressure while lowering anxiety scores (p<0.05). In vitro studies demonstrate potent anti-inflammatory effects through inhibition of nitric oxide production in dendritic cells. The evidence base remains limited with small sample sizes, requiring larger clinical trials to establish therapeutic dosing and long-term safety. Most research focuses on aromatherapy applications rather than oral supplementation.
Safety & Interactions
Lemongrass is generally recognized as safe when used as a culinary herb or short-term aromatherapy. Topical application may cause contact dermatitis in sensitive individuals due to citral content. No significant drug interactions are documented, though theoretical concerns exist with blood pressure medications due to hypotensive effects. Pregnancy and breastfeeding safety data is insufficient, warranting caution during these periods.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Cymbopogon citratusLemongrassWest Indian lemongrassCitronella grassFever grassCapim-cidraoSerehBhustrina
Frequently Asked Questions
How much citral is in lemongrass essential oil?
Lemongrass essential oil contains 65-85% citral, consisting of two isomers: geranial (citral a) and neral (citral b). This high concentration makes lemongrass one of the richest natural sources of citral compounds.
What blood pressure reduction was seen in lemongrass studies?
The RCT with 66 patients showed statistically significant reductions in both systolic and diastolic blood pressure following lemongrass aromatherapy (p<0.05). However, the study did not report specific mmHg reductions, limiting dosing guidance.
Can lemongrass cause allergic reactions?
Yes, lemongrass can cause contact dermatitis and allergic reactions, particularly with topical use. The citral content is the primary allergen, with sensitization rates increasing with repeated exposure.
Does lemongrass interact with anxiety medications?
No documented interactions exist between lemongrass and anxiety medications. However, since lemongrass demonstrates GABA-modulating effects, theoretical additive sedation could occur with benzodiazepines or other CNS depressants.
Is lemongrass safe during pregnancy?
Safety data for lemongrass use during pregnancy is insufficient for recommendations. While culinary amounts are likely safe, therapeutic doses through supplements or concentrated aromatherapy should be avoided until more research establishes safety profiles.
What is the difference between lemongrass tea, essential oil, and dried leaf extract for health benefits?
Lemongrass tea and dried leaf preparations contain the full polyphenolic profile and are suitable for oral consumption, while essential oil is concentrated in volatile compounds like citral and is typically used for aromatherapy due to potency and irritant potential if ingested undiluted. Extract forms standardize active constituents and may offer consistent dosing for clinical applications, whereas tea provides a gentler, food-based delivery method. The choice depends on intended use: aromatherapy favors essential oil, daily wellness typically uses tea or dried leaf, and targeted supplementation may use standardized extracts.
What does research show about lemongrass effectiveness for inflammation compared to common anti-inflammatory herbs?
Lemongrass polyphenolic fractions have demonstrated inhibition of inflammatory pathways in dendritic cells (specifically reducing LPS-induced NO and iNOS expression), suggesting comparable anti-inflammatory mechanisms to herbs like turmeric and ginger that target similar cytokine pathways. However, direct head-to-head clinical trials comparing lemongrass to other herbs in humans remain limited, making it difficult to establish relative potency. Most evidence for lemongrass anti-inflammation comes from in vitro studies rather than large-scale human trials, whereas turmeric and ginger have more extensive clinical documentation.
Who would benefit most from lemongrass supplementation: pre-surgery patients, those with chronic anxiety, or people with inflammatory conditions?
Pre-surgery patients show the strongest clinical evidence, with RCT data (n=66) demonstrating significant reductions in both anxiety and blood pressure during the perioperative period, suggesting lemongrass is particularly valuable for acute stress management. Individuals with chronic anxiety or inflammatory conditions may also benefit based on mechanism-of-action studies, but clinical efficacy in these populations requires larger human trials for confirmation. Lemongrass appears most practical for time-limited anxiety (surgical, acute stress) where aromatherapy delivery is feasible, rather than as a primary treatment for chronic conditions currently managed by pharmaceutical interventions.
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