Botanical Overview
Lemon (Citrus limon) is a flowering plant in the Rutaceae family. Traditional medicine systems have documented several valuable applications for this species, supported by its observed therapeutic effects. The citrus family (Rutaceae) includes trees and shrubs with gland-dotted leaves that release aromatic oils when crushed. The flowers are typically white with four or five petals, and the fruits are often modified berries with a leathery rind. Most species produce alkaloids and limonoids with medicinal activity.
General Description
A true lemon is a hybrid of the citron and the bitter orange. Its origins are uncertain, but some evidence suggests lemons originated during the 1st millennium BC in what is now northeastern India. Some other citrus fruits are called lemon.
Family Context
The Rutaceae family is primarily tropical and subtropical. Notable medicinal members include:
- Kabusu — 76 documented uses
- Petitgrain — 76 documented uses
- Rue — 54 documented uses
- Orange — 47 documented uses
Traditional Uses
Lemon has been traditionally used for digestive health, respiratory conditions, and urinary tract health, among other applications.
Digestive health.
- Diarrhea
- Dysentery
- Carminative
- Stomachic
For digestive complaints, the herb is typically prepared as a tea or decoction taken before meals. The bitter compounds stimulate digestive secretions and improve nutrient absorption. Some traditions use the powdered root or leaves in small doses as a stomachic tonic.
Respiratory conditions.
- Cold
- Pneumonia
Respiratory conditions are addressed through steam inhalation of the herb’s vapors or internal use as a warm tea. The hot infusion acts as an expectorant, helping to loosen phlegm and clear congestion. Some traditions combine it with honey for coughs.
Urinary tract health.
- Diuretic
Urinary tract applications typically involve drinking the herb as a mild tea, which increases urine production and helps flush the urinary system. It may be combined with other demulcent herbs to soothe irritated tissues.
Active Compounds
Phytochemical research has identified 30 compounds in this species, including a diverse array of phytochemical classes (see the Complete Chemical Inventory below for the full list).
The identified compounds include the following categories:
- Flavonoid: antioxidant compounds that protect cells from oxidative damage
- Coumarin: aromatic compounds with anticoagulant and anti-inflammatory effects
- Alkaloid: nitrogenous compounds with diverse pharmacological activities