Scientific Monograph
Trachyspermum ammi (L.) Sprague — Ajwain
Family Apiaceae. Common names: ajwain, carom, bishop's weed. Part used: dried fruit (seed).
Active constituents
| Constituent | Typical level | Role |
|---|---|---|
| Essential oil (total) | 2.5 – 5% of seed | Primary active fraction |
| Thymol | 35 – 60% | Antispasmodic, antimicrobial marker compound |
| γ-Terpinene | 15 – 30% | Antioxidant |
| p-Cymene | 10 – 25% | Supports antimicrobial activity |
| Carvacrol | < 5% | Antispasmodic |
| Fibre, protein, fatty acids | Balance | Nutritional matrix |
Mechanism of action
- Smooth muscle relaxation: thymol and carvacrol block calcium channels in intestinal muscle, easing spasm and cramping.
- Carminative effect: volatile oils relax the digestive tract and help expel gas.
- Digestive stimulation: increases gastric acid, bile and digestive enzyme activity, shortening food transit time.
- Antimicrobial activity: thymol disrupts bacterial and fungal membranes.
Traditional & modern validation
Ajwain is recorded in Ayurvedic and Unani texts as a remedy for indigestion, colic and flatulence. Laboratory and animal studies confirm its antispasmodic and digestive-stimulant effects. Human clinical evidence is encouraging but limited in size; claims are therefore supported mainly by traditional use.