Cough High in Vitamin C, Watercress is used as a general tonic, and its bitter taste is thought to stimulate the appetite and improve digestion. In Italy, compresses made from Watercress are used to treat arthritis.
Homeopathic practitioners prescribe it for nervous conditions, constipation, and liver disorders.
Only as a remedy for cough and bronchitis, however, has it been conclusively found effective. The plant is found almost all over the world and is grown commercially in many regions. Watercress contains mustard oil, a compound that flushes excess water from the body. Researchers have also shown that the herb kills bacteria. Not for children under 4.