The common cold, typically caused by human parainfluenza viruses, remains one of the most frustrating of medical illnesses, given its incidence and prevalence. The common cold has significant effects on health, well-being, and productivity.
There are no reliable interventions currently available that significantly protect against influenza infections or prevent the occurrence of this illness. There have been several clinical trials evaluating a variety of dietary supplements for the prevention and treatment of both experimentally induced and naturally occurring colds.
Biological response modifiers such as beta-glucan, specifically Transfer Point Beta-1,3D Glucan, enhance the innate immune response without inducing damaging pro-inflammatory cytokines, and may represent a novel approach to protect against cold and flu pathogens. source