Could a sphingosine nasal spray prevent COVID-19?
https://www.drugtargetreview.com/news/72711/could-a-sphingosine-nasal-spray-prevent-covid-19/
The team from the University of Cincinnati (UC), US, established that sphingosine – a lipid naturally found in the human body, which is key for cellular lipid metabolism – is important in the local immune defences of epithelial cells, which line the surfaces of the body (eg, skin, blood vessels, urinary tract and organs) and protect them from pathogens.
Very good question!!