K1- Phylloquinone- plant source
K2- Menaquinone- intestinal bacteria
K3- Menadione- synthetic

only fat soluble vitamin act as a coenzyme

Biochemical Functions
1. post translational gamma carboxylation of clotting factors II,VII,IX,X
2. Activation of Osteocalcin
3. Activation of protein C and S

Deficiency manifestation
hemorrhagic disease of newborn

RDA- 70-140 microgram