Efficacy of liriope platyphylla extract for improving respiratory functions: Study protocol for a randomized, double-blinded, placebo-controlled pilot trial.

This study has limited inclusion and exclusion criteria and the intervention will be well-controlled. This will be the first randomized controlled trial to assess the efficacy and safety of LP extract in adults with cough and sputum. This study will provide insight into the mechanisms of the anti-inflammatory effects and improvement of respiratory function of LP.