Vitamin K Deficiency Calculator | Bleeding and Bone Risk -- Daily Health Tools
Vitamin K
Deficiency Checker
Vitamin K is essential for blood clotting and bone health. This tool checks both your K1 bleeding risk AND your K2 bone health risk separately -- with personalised food sources, Warfarin interaction warning, and a complete recovery plan. Based on NHS and NIH guidelines.
What Is Vitamin K and Why Does It Matter?
Vitamin K is one of the most clinically underappreciated vitamins. While most people are aware of Vitamins C and D, Vitamin K -- particularly K2 -- remains poorly understood despite growing evidence of its importance for bone density, arterial health, and cardiovascular disease prevention. The key challenge is that Vitamin K deficiency has two distinct clinical pictures: K1 deficiency presents with bleeding and clotting problems, while K2 insufficiency may be widespread and presents insidiously through gradual bone loss and arterial calcification over decades.
Vitamin K1 vs K2 -- Two Different Vitamins, Two Different Roles
Vitamin K1 -- The Clotting Vitamin
Vitamin K1 is the primary form found in food -- particularly green leafy vegetables including kale, spinach, broccoli, and collard greens. It activates blood clotting factors II, VII, IX, and X in the liver. Without adequate K1, blood does not clot properly and excessive bleeding occurs even from minor cuts. K1 has a very short half-life -- it is cleared within hours -- meaning daily intake is important. This is also why Warfarin (which blocks Vitamin K's role in clotting factor activation) can be rapidly affected by large changes in green vegetable consumption. Check your blood pressure regularly with our Blood Pressure Checker.
Vitamin K2 -- The Bone and Heart Vitamin
Vitamin K2 -- particularly the MK-7 form found in fermented foods and MK-4 found in animal products -- has a completely different and arguably more important role for long-term health. K2 activates two critical proteins: osteocalcin (which binds calcium into bone matrix) and matrix Gla protein (MGP), which prevents calcium from depositing in arteries and soft tissues. Low K2 is therefore associated with both osteoporosis and arterial calcification. K2 has a much longer half-life than K1, particularly the MK-7 form. Use our Calcium Calculator alongside this tool for a complete bone health picture. Vitamin K2 works synergistically with Vitamin D3 -- assess your D status with our Vitamin D Calculator.
Signs and Symptoms of Vitamin K Deficiency
K1 Deficiency -- Bleeding Symptoms
- Excessive bleeding from cuts: Blood takes much longer than normal to clot -- even small cuts bleed for extended periods
- Easy and excessive bruising: Minor bumps cause disproportionately large bruises
- Bleeding gums: Gums bleed during brushing or eating
- Nosebleeds: Frequent or prolonged nosebleeds without obvious cause
- Blood in urine: Urine appears pink, red, or dark
- Blood in stools: Dark, tarry, or red-streaked stools -- always warrants medical assessment
- Heavy menstrual periods: Unusually prolonged or heavy bleeding
- Slow wound healing: Surgical or dental wounds take longer to stop bleeding
K2 Insufficiency -- Bone and Cardiovascular Signs
- Low bone density or osteoporosis: K2 deficiency impairs osteocalcin, reducing calcium incorporation into bone
- Frequent fractures: Bones fracture more easily than expected for age
- Arterial calcification: Calcium deposits in arterial walls contributing to cardiovascular disease
- Dental problems: Poor mineralisation of teeth and enamel
- Kidney stones: MGP deficiency can allow calcium deposits in kidneys
- Calcium supplements not improving bone density: Without K2, supplemental calcium may deposit in arteries instead of bones
Who Is Most at Risk?
Newborns -- Vitamin K Deficiency Bleeding (VKDB)
Newborns are the highest-risk group for clinically significant Vitamin K deficiency. Vitamin K does not cross the placenta efficiently, and breast milk contains relatively little K1. This vulnerability can cause Vitamin K Deficiency Bleeding (VKDB) -- including catastrophic intracranial haemorrhage within the first weeks of life. This is why the NHS and American Academy of Pediatrics both recommend all newborns receive an intramuscular Vitamin K injection at birth.
People on Warfarin
Warfarin works by blocking the recycling of Vitamin K in the liver, thereby inhibiting Vitamin K-dependent clotting factors. People on Warfarin should NOT suddenly change their Vitamin K intake as this can dangerously affect INR control. The correct approach is consistent intake -- maintaining the same level of green vegetable consumption so Warfarin dose can be calibrated to it. Sudden increases can dramatically reduce INR and increase clotting risk.
Fat Malabsorption Conditions
Vitamin K is fat-soluble, meaning it requires dietary fat for absorption. Conditions that impair fat absorption -- including Crohn's disease, ulcerative colitis, coeliac disease, liver disease, and short bowel syndrome -- significantly impair Vitamin K absorption regardless of dietary intake. Check your iron status with our Iron Calculator, as iron deficiency also commonly co-occurs with malabsorption.
Daily Vitamin K Requirements
| Group | US Adequate Intake | UK Reference Intake |
|---|---|---|
| Children 1-3 years | 30 mcg | 30 mcg |
| Children 4-8 years | 55 mcg | 35 mcg |
| Children 9-13 years | 60 mcg | 45 mcg |
| Teens 14-18 years | 75 mcg | 55 mcg |
| Adult women 19+ | 90 mcg | ~65 mcg (1 mcg/kg) |
| Adult men 19+ | 120 mcg | ~80 mcg (1 mcg/kg) |
| Pregnant women | 90 mcg | 65-80 mcg |
| Breastfeeding women | 90 mcg | 65-80 mcg |
Best Food Sources of Vitamin K
Vitamin K1 Rich Foods
Cooked collard greens contain approximately 1059 mcg per cup -- nearly 10 times the daily requirement in a single serving. Cooked spinach provides 888 mcg per cup; kale 547 mcg; broccoli 220 mcg; and Brussels sprouts 219 mcg. Crucially, Vitamin K is fat-soluble -- eating these vegetables with olive oil or other healthy fats dramatically increases absorption.
Vitamin K2 Rich Foods
The richest source of K2 is natto -- a Japanese fermented soybean product containing approximately 850 mcg per 100g. This is followed by hard cheeses like Gouda (76 mcg per 100g), egg yolk (32 mcg per egg), butter (15 mcg per 100g), and chicken liver (14 mcg per 100g). Grass-fed animal products generally contain more K2 than grain-fed products.
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