Dramatic Decrease of Vitamin K2 Subtype Menaquinone-7 in COVID-19 Patients (1) Background: Vitamin K (VK) is a fat-soluble compound with a common chemical structure, a 2-methyl-1,4-naphthoquinone ring, and a variable aliphatic side-chain. VK is involved in the synthesis of b...

pmc.ncbi.nlm.nih.gov/articles/PMC...

Vitamin K1 and especially K2 ( #MK4, #MK7) act as antioxidants."

"A paralogue enzyme of vitamin K oxidoreductase 1 ( #VKORC1), named VKORC1-like one ( #VKORC1L1), is expressed in many tissues."