Although experts have been able to confirm its effectiveness, the spray acts as a temporary solution.
Unlike vaccines, they would need regular re-application.
Nasal sprays produce nitric oxide, a nano molecule already present in the body, which disrupts the development of a viral load .
Covid nasal spray: Covid vaccine effectiveness compared (Image: EXPRESS)
Pankaj Sharma, a Professor of Neurology at Royal Holloway, University of London, explained the process to the Daily Telegraph.
He told the publication the spray aims to kill the infection where it grows, in the back of the throat.
Professor Sharma said: We all have it in our body: it keeps the blood vessels dilated and it’s involved in immunity.