Centuries after Donguibogam stated that Ophiopogonis Radix moistens the lungs, modern science is uncovering these mechanisms one by one. The dry cough we commonly experience is not caused simply by dryness alone; it arises from complex factors, including chronic inflammation of the respiratory mucosa, immune hypofunction, and autonomic nervous system imbalance. In particular, when mucus secretion in the lungs and bronchus decreases and the mucosa is damaged, sensitivity to external stimuli rises, easily triggering a cough response even from minor dust or cold air. Ophiopogonis Radix contains abundant bioactive substances, especially saponin and polysaccharide components. These components provide scientific evidence for easing cough and phlegm symptoms. First, the saponin in Ophiopogonis Radix promotes bronchial mucus secretion and thins sticky phlegm to facilitate expectoration. It can also contribute to relaxing bronchial smooth muscle, widening the airway, and easing breathing. Second, the polysaccharide components provide an outstanding moisturizing effect. They supply hydration to the dried respiratory mucosa to form a protective barrier, shield the mucosa from external irritants, and aid its regeneration. This plays an essential role in improving mucosal dryness and inflammation, which are primary causes of dry cough. Third, Ophiopogonis Radix has reported immunomodulation and anti-inflammatory activities. Chronic cough is often linked to micro-inflammation of the respiratory mucosa, and Ophiopogonis Radix extract can suppress inflammatory responses and regulate immune cell activity, helping improve overall respiratory system health. This is significant because it goes beyond mere symptom suppression to contribute to the fundamental recovery of respiratory health. Furthermore, some studies suggest that Ophiopogonis Radix regulates the human stress response and stabilizes the nervous system, which can provide psychological calm to patients with chronic cough aggravated by stress. Rather than being just a folk remedy, Ophiopogonis Radix serves as a valuable medicinal herb grounded in scientific evidence, offering gentle comfort and solutions for modern individuals dealing with a dry throat and chronic cough.
