Cymbopogon flexuosus

In India, warm infusions of fresh or dried leaves are taken to ease mild colds and fever, and crushed leaf sheaths are sometimes applied as a poultice for headaches; Ayurvedic pharmacopoeias record similar preparations. In Thailand and Malaysia, a classic decoction of lemongrass sheaths with ginger is given for stomach upset, coughs, and colds, often as a household remedy. In Sri Lanka and across parts of Southeast Asia, the leaf infusion is valued as a gentle digestive tonic. These uses are documented in the Herbal Pharmacopoeia of the Indian Herbal Association, the WHO monographs on selected medicinal plants, and the Spice and Medicinal Plants of Sri Lanka by Jayaweera.

For a practical recipe: make a mild tea by simmering about 6–8 g of fresh cut leaf (about 2–3 cm pieces) in 500 mL of water for 10 minutes, then steep, covered, off heat for 5–7 minutes and strain. Alternatively, use 2 g dried leaf per 200 mL water and steep for 10 minutes. If you prefer a 1:5 tincture, macerate 20 g of dried leaf in 100 mL of 45–50% ethanol for 2–3 weeks in the dark, shaking occasionally, then press and filter. Safety note: use moderate amounts; essential‑oil components can be skin‑irritating; avoid in early pregnancy and on broken skin unless advised by a practitioner.

Active constituents reported for Cymbopogon flexuosus are the essential‑oil components citral (neral and geranial), geraniol, myrcene, citronellal, limonene, and often β‑caryophyllene, with the oil being primarily citral‑rich; these fit the profile used traditionally for mild respiratory and digestive support.

Modern relevance is strong: research on essential oil and extracts continues, and commercial teas, oils, and dietary supplements featuring lemongrass remain widely available in global markets.

Common products:
Citral-rich essential oil (cooking grade) and high-purity citral (neral and geranial mixture).

Industrial and craft applications:
Natural fragrance component in household cleaners, detergents, air care, and fabric care. Citral as a fragrance ingredient and intermediate for aroma-chemical synthesis (e.g., ionones) in fine fragrance and flavor formulations.

Food and beverages (non-medicinal):
Flavoring agent in beverages, confectionery, and savory foods at typical usage levels; major contributor of lemon-like aroma. Food-grade essential oil or citral preparations may be used as flavoring.

Fragrance and cosmetics:
Perfume and cosmetic ingredient (e.g., soaps, lotions, shampoos) for lemon-like top-note; fragrance dosage limited in leave-on applications due to IFRA standards for citral.

Properties relevant to use:
Typical commercial oil contains 65–85% citral (neral:geranial ≈ 1:1) with a characteristic lemon odor; density ~0.89–0.92 g/mL (20 °C); refractive index ~1.483–1.490 (20 °D). Citral readily undergoes acid-catalyzed cyclization to α- and β-ionone, enabling aroma-chemical derivatization.

Standards and regulation:
IFRA standards limit citral in certain product types to address sensitization risk. Flavor use complies with national food-additive regulations (e.g., FEMA GRAS/US; EU Flavouring Regulation). Agricultural practice is guided by ISO 3215 for Cymbopogon cultivation and harvesting where applicable.

Sustainability and sourcing:
Primarily cultivated in India and other tropical regions; products are obtained by steam distillation of fresh or partly dried leaves and stems. Supply is influenced by crop agronomy and oil-yield seasonality; traceability supports quality and regulatory compliance.

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