Vitamin K (phylloquinone and menaquinone) are a group of fat soluble vitamins required for blood clotting homeostasis. Menaquinone is synthesised by normal flora in the intestine. Vitamin K serves as a coenzyme for the clotting factors 2, 7, 9 and 10. Warfarin inhibits vitamin K.
Pathological manifestations are rare. Hypervitaminosis K can lead to jaundice and anaemia in the newborn.
- 1. Pamela C. Champe, Richard A. Harvey (Ph. D.), Denise R. Ferrier. Biochemistry. ISBN: 0781769604