Clinical trials

The goal of this clinical trial is to learn if Immune X can help prevent common cold events in healthy adults who have a history of upper respiratory tract infections. The main questions it aims to answer are: * Does Immune X reduce the proportion of participants who experience at least one clinically confirmed common cold event during the study period? * Does Immune X affect the number, duration, and severity of common cold events? Researchers will compare Immune X to a placebo (a look-alike capsule containing inactive ingredients) to see if Immune X helps prevent common cold events. Participants will: * Take Immune X or placebo daily for 16 weeks during the winter season. * Attend study visits at the beginning and end of the study and complete questionnaires and symptom assessments throughout the study. * Record cold symptoms, medications, and other study information using a smartphone application. * Provide blood and stool samples during the study.