Rhinovirus infections have afflicted humanity since the dawn of civilization, and are difficult to treat even with
modern medicine.

Throughout the ages many remedies have been used for the common cold, often caused by the
rhinovirus. Recent research points to a flavanol anti-oxidant, quercetin, as having therapeutic properties. Quercetin
has been shown to reduce viral internalization and replication in vitro, and viral load, lung inflammation and airways
hyper-responsiveness in vivo.