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Vitamin K1 and K2
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Vitamin K exists in two main forms: K1 (phylloquinone), found mainly in green leafy vegetables, and K2 (menaquinone), found in fermented foods and animal products. Both forms are essential for proper blood clotting, helping your body stop bleeding when injured. Vitamin K2 also plays a crucial role in bone health and cardiovascular health by helping to direct calcium to your bones rather than allowing it to deposit in your arteries. Low levels may increase your risk of excessive bleeding, while adequate levels support healthy bones and blood vessels.
Prepare for your Vitamin K (Nutritional) Blood Test by following these instructions.
Sample collection and timing
Fasting and hydration
Most people get all the vitamin K they need through a varied and balanced diet. Because vitamin K is a fat-soluble vitamin, any vitamin K in the body that is not needed immediately is stored in the liver for future use. Green leafy vegetables, including broccoli and spinach, vegetable oils, and fortified cereals, are all good sources of vitamin K.
In the UK, for people who eat a healthy, balanced diet, vitamin K deficiency is rare. However, people with conditions that limit the absorption of dietary vitamins, such as biliary obstruction, coeliac disease, ulcerative colitis, and cystic fibrosis, can be at risk of vitamin K deficiency. Vitamin K supplements are available but monitoring the dose is important as too much can be harmful, so please speak with your doctor before supplementing vitamin K.
Vitamin K refers to a group of fat-soluble vitamins that play a role in blood clotting, regulating blood calcium levels, and bone metabolism. In the liver, vitamin K helps supports prothrombin and factors VII, IX, and X, which are necessary for blood to clot properly.
