Vitamin K is another fat-soluble nutrient that plays an important role in the synthesis of clotting factors in the liver. It is involved in production of prothrombin and clotting factors 2,7,9,and 10.
Vitamin K is involved in calcium metabolism and mineralisation of the bone especially in the prevention and treatment of osteoporosis.
- Leafy green vegetables, soybeans, cabbage, broccoli, spinach, alfalfa, lettuce.
- Yoghurt, egg yolk, cow’s milk, polyunsaturated and fish liver oils.
- Bacterial synthesis in the gut.26,5
It has three types: Phylloquinone or K1 and Menaquinone or K2 which are synthesised in the gut. The synthetic form is called Menadione or K3.
Natural vitamin K is deposited in the body and it is non-toxic. However, the synthetic form may cause vomiting, thrombosis, sweating and chest constriction.
Warning: A word of caution for patients on blood thinning drugs such as Warfarin. They should take vitamin K with extra care and must consult with their doctor prior to commencing it. The doctor may need to increase the dose of Warfarin depending on their blood therapeutic level.
RDA 50-80 mcg per day
EDR 50-100mcg per day
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