Cold & Flu Guard

**Cold & Flu Guard** is an over-the-counter oral and nasal spray product developed by Oral Science International for prevention and symptomatic relief of upper respiratory tract infections, including the common cold and influenza. It contains **Flavobac**, a patented citrus-derived bioflavonoid complex, together with **high molecular weight hyaluronic acid**, and is intended to act primarily by **forming a protective physical barrier** over the mucosa of the mouth, throat, and nose, thereby reducing pathogen contact with epithelial surfaces and helping shorten duration and severity of symptoms. It has been described as a natural health product or supplement rather than a prescription pharmaceutical, and its antiviral claims are based on barrier and surface-protective activity rather than a defined receptor-targeted pharmacology.

Brand names

Cold & Flu Guard