หนาดงวงช้าง (Nad Nguang Chang) / Vernonia
Family: Asteraceae
Gymnanthemum amygdalinum, also known as Vernonia or Bitter Leaf, is a perennial herb widely used in Thai and Southeast Asian herbal medicine. It is known for its cleansing, liver-supportive, and digestive properties, and is valued for balancing the body’s internal systems through bitterness.
Botanical Characteristics
This upright shrub grows 1–3 meters tall, with woody stems and elongated, serrated leaves of a vibrant green color. The leaves are intensely bitter and emit a mild herbal aroma when crushed. It thrives in warm, humid conditions and is well adapted to tropical garden environments.
Traditional Medicinal Uses
In Thai traditional medicine, หนาดงวงช้าง is used to detoxify the blood, stimulate digestion, and regulate bile flow. It is commonly prescribed to treat fatigue, poor appetite, and liver sluggishness. The leaves are often boiled or steeped to make a bitter tonic, taken in small amounts for internal cleansing.
Medicinal Compounds
The plant contains saponins, flavonoids, and sesquiterpene lactones—compounds known for their anti-inflammatory and hepatoprotective effects. These phytochemicals contribute to its use as a gentle tonic for the liver and digestive system.
Preparation and Application
Fresh or dried leaves can be brewed into herbal tea or boiled into decoctions. Externally, crushed leaves may be applied to soothe skin irritations or insect bites. Its bitterness is believed to ‘cool’ the body, reduce inflammation, and promote balance in Thai traditional medical theory.
Cultivation Notes
Gymnanthemum amygdalinum prefers full sun and well-drained soil rich in organic matter. It responds well to pruning and can be propagated through cuttings. Regular watering encourages lush growth, though the plant tolerates short dry periods once established.
Disclaimer: This information is provided for educational and historical purposes only. It is not intended as medical advice. Always consult a qualified healthcare professional before using any herbal preparation.
