Vitamin K exist in three form-
1. Vitamin K1 (Phylloquinone / Phytomenadione): found in green leafy vegetables
2. Vitamin K2 (Menaquinone): Synthesized by intestinal bacteria
3. Vitamin K3 (Menadione): Synthetic compound, metabolized into K1 (phylloquinone)
Vitamin K dependent proteins-
1. Clotting factors: Factors II (prothrombin), VII, IX, and X (2, 7, 9, 10)
2. Anticoagulant proteins: Protein C, Protein S
3. Osteocalcin (in bone)
4. Matrix Gla protein (in bone)
5. Nephrocalcin (in kidney)