Clinical studies consistently show that initiating targeted treatments or interventions at the very onset of cold and upper respiratory symptoms leads to a milder disease course, shorter duration, and faster recovery.
The retrieved literature contains several clinical trials examining interventions for common colds and upper respiratory tract infections when administered early in the course of symptoms. Studies on cineole, traditional Chinese herbal granules, and inosine pranobex all demonstrate that earlier treatment timing correlates with reduced symptom severity, lower overall disease burden, and shorter recovery times. Therefore, the claim is supported by direct empirical evidence.