"To stop getting ill, I use BioSURE PRO Nasal Spray (£14.95, bebiosure.com) as it contains ELAH (ethyl lauroyl arginate hydrochloride), which prevents viruses from attatching to the nasal passages, essentially stopping the virus before I reaches a dangerous level," says oncologist Dr Gaffar. "When viruses get into nasal passages, they cann start replicating very fast and, when they replicate and reach certain levels, they are able to move to other areas of the body, especially the lungs, where they can create havoc. This nasal spray interupts that process. I also recommend it to all my immunocompromised patients."