the leafy greens contain a lot of Vitamin K, however...a coagulant that may not be the best thing to have high amounts of in the system with a COVID19 infection.
Regular Use of VKA Prior to COVID-19 Associated with Lower 7-Day Survival in Hospitalized Frail Elderly COVID-19 Patients: The GERIA-COVID Cohort Study.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7824717/
If you or a family member are older than 83, you might want to go easy on Vitamin K sources.