“My advice would be to take those vitamin K supplements. Even if it does not help against severe Covid-19, it is good for your blood vessels, bones and probably also for the lungs.”
Dr Janssen added: “We have [vitamin] K1 and K2. K1 is in spinach, broccoli, green vegetables, blueberries, all types of fruit and vegetables. K2 is better absorbed by the body. It is in Dutch cheese, I have to say, and French cheese as well.”
A Japanese delicacy of fermented soya beans called natto is particularly high in the second type of vitamin K and there may be cause for further studies into its health benefits, he noted.
Jona Walk, a second researcher on the study, said: “We want to take very sick COVID-19 patients and randomise so that they get a placebo or vitamin K, which is very safe to use in the general population.”