Vitamin K Calculator
Professional Daily Intake & Food Content Calculator
Calculate your daily vitamin K needs, track food sources, and manage warfarin interactions with confidence
Daily Intake Calculator
Food Content Calculator
Comprehensive Vitamin K Food Database
| Food Item | Serving Size | Vitamin K Content | Category |
|---|---|---|---|
| Spinach (cooked) | 1 cup (180g) | 888 mcg | Leafy Green |
| Kale (cooked) | 1 cup (130g) | 1062 mcg | Leafy Green |
| Collard Greens (cooked) | 1 cup (190g) | 1059 mcg | Leafy Green |
| Broccoli (cooked) | 1 cup (156g) | 220 mcg | Cruciferous |
| Brussels Sprouts (cooked) | 1 cup (156g) | 218 mcg | Cruciferous |
| Cabbage (cooked) | 1 cup (150g) | 163 mcg | Cruciferous |
| Asparagus | 1 cup (134g) | 91 mcg | Vegetable |
| Green Beans (cooked) | 1 cup (125g) | 60 mcg | Vegetable |
| Lettuce (Romaine) | 1 cup (47g) | 103 mcg | Leafy Green |
| Parsley (fresh) | 1/4 cup (15g) | 246 mcg | Herb |
| Basil (fresh) | 1/4 cup (10g) | 27 mcg | Herb |
| Blueberries | 1 cup (148g) | 29 mcg | Fruit |
| Kiwi Fruit | 1 medium (69g) | 28 mcg | Fruit |
| Avocado | 1/2 fruit (75g) | 21 mcg | Fruit |
| Olive Oil | 1 tablespoon (14g) | 8 mcg | Oil |
| Soybean Oil | 1 tablespoon (14g) | 26 mcg | Oil |
| Natto (fermented soybeans) | 1 serving (100g) | 939 mcg | Fermented (K2) |
| Sauerkraut | 1 cup (142g) | 71 mcg | Fermented (K2) |
| Cheese (Hard) | 1 oz (28g) | 2-5 mcg | Dairy (K2) |
| Yogurt (Plain) | 1 cup (227g) | 0.3 mcg | Dairy (K2) |
Vitamin K & Warfarin Management
Vitamin K is a cofactor for clotting factors II, VII, IX, and X. Warfarin works by inhibiting vitamin K-dependent clotting factors. When you consume more vitamin K, it reduces warfarin’s effectiveness, potentially lowering your INR (International Normalized Ratio). Conversely, consuming less vitamin K increases warfarin’s effect, potentially raising your INR.
The key principle: Consistency matters more than avoidance. Maintaining a stable vitamin K intake helps keep your INR stable and predictable.
INR (International Normalized Ratio) measures how long blood takes to clot. It’s a standardized test that accounts for differences in laboratory methods.
- Normal INR: 0.8-1.1 (normal clotting)
- Therapeutic INR on Warfarin: 2.0-3.0 (for most conditions)
- Higher INR: Increased bleeding risk
- Lower INR: Increased clotting risk
Regular INR monitoring is essential for warfarin patients to ensure the dose is therapeutic.
Most warfarin patients can safely consume the recommended daily allowance of vitamin K:
- Adult Men: 120 mcg/day
- Adult Women: 90 mcg/day
The goal is consistency, not avoidance. Sudden large increases or decreases in vitamin K intake can destabilize your INR. If you want to increase vitamin K intake, do so gradually and inform your healthcare provider.
You don’t need to avoid these foods, but maintain consistent intake:
- Spinach, kale, and other dark leafy greens
- Broccoli and brussels sprouts
- Asparagus and green beans
- Cabbage and collard greens
- Natto (fermented soybeans)
- Green tea (contains vitamin K)
- Cranberry juice (may potentiate warfarin)
- Be consistent: Eat similar amounts of vitamin K daily
- Track intake: Use this calculator to monitor your vitamin K
- Inform your doctor: Tell them about dietary changes
- Regular testing: Get INR checks as recommended
- Avoid alcohol: Can affect warfarin metabolism
- Take warfarin consistently: Same time daily
- Report symptoms: Unusual bleeding or bruising
- Update medications: Inform doctor of new drugs or supplements
Vitamin K Health Information
Vitamin K is a fat-soluble vitamin essential for blood clotting and bone metabolism. There are three main types:
- Vitamin K1 (Phylloquinone): Found in plants, especially leafy greens. Primary dietary source.
- Vitamin K2 (Menaquinone): Produced by bacteria in the gut and found in fermented foods. Important for bone and cardiovascular health.
- Vitamin K3 (Menadione): Synthetic form, rarely used in supplements.
- Blood Clotting: Essential for producing clotting factors
- Bone Health: Activates osteocalcin, important for bone formation
- Cardiovascular Health: Helps prevent arterial calcification
- Calcium Regulation: Controls calcium deposition in bones and vessels
- Immune Function: Supports immune system regulation
- Brain Health: May support cognitive function and neurological health
- Anti-inflammatory: May help reduce chronic inflammation
Vitamin K deficiency is rare in adults but can occur with certain conditions:
- Excessive bleeding or easy bruising
- Blood in urine or stool
- Nosebleeds
- Heavy menstrual bleeding
- Weak bones (osteoporosis)
- Increased fracture risk
Risk factors for deficiency: Malabsorption disorders, antibiotic use, liver disease, cystic fibrosis, celiac disease.
Vitamin K interacts with several medications:
- Warfarin (Coumadin): Vitamin K reduces warfarin effectiveness
- Antibiotics: May reduce vitamin K production in gut
- Cholesterol medications: May affect vitamin K absorption
- Anticonvulsants: May increase vitamin K requirements
- Aspirin: High doses may increase bleeding risk
Always inform your healthcare provider about your vitamin K intake and any supplements.
Vitamin K has no established upper limit (UL) from food sources. It’s fat-soluble but generally considered safe even at high intakes from food. However, high-dose supplements should be used cautiously, especially in patients taking warfarin or other anticoagulants.
Note: Vitamin K1 is considered safe, but Vitamin K3 (synthetic) may cause hemolytic anemia and liver damage at high doses.
Frequently Asked Questions
The recommended daily allowance (RDA) for adults is:
- Men (19+): 120 mcg
- Women (19+): 90 mcg
- Pregnant/Breastfeeding: 90 mcg
Use our Daily Intake Calculator to find your personalized recommendation based on age and weight.
Vitamin K1 (Phylloquinone): Plant-based, found in leafy greens. Primarily used for blood clotting. Most abundant form in diet.
Vitamin K2 (Menaquinone): Produced by gut bacteria and found in fermented foods. Important for bone and cardiovascular health. May have additional health benefits beyond clotting.
Both are important for health. A balanced diet should include both sources.
Yes! Most people can easily meet their daily vitamin K needs through a balanced diet. Just one cup of cooked spinach contains over 7 times the daily requirement. Other good sources include kale, broccoli, brussels sprouts, and other leafy greens.
Supplements are typically only needed for those with malabsorption disorders or specific medical conditions.
No! You should not avoid vitamin K foods. Instead, maintain consistent intake. Sudden changes in vitamin K consumption can destabilize your INR.
If you currently eat little vitamin K and want to increase it, do so gradually and inform your healthcare provider. Your warfarin dose can be adjusted accordingly.
The key is predictability and consistency, not avoidance.
INR testing frequency depends on your stability:
- Starting warfarin: Every 2-3 days initially
- First month: Weekly
- Stable on warfarin: Every 2-4 weeks
- Long-term stable: Every 4-12 weeks
Your healthcare provider will determine the appropriate testing schedule for you.
High INR (increased bleeding risk): Your healthcare provider may reduce your warfarin dose or recommend vitamin K supplementation.
Low INR (increased clotting risk): Your healthcare provider may increase your warfarin dose.
Never adjust your warfarin dose yourself. Always consult your healthcare provider for dose adjustments based on INR results.
Vitamin K1 supplements are generally safe for most people. However:
- Warfarin patients: Should only take supplements under medical supervision
- Vitamin K3: Synthetic form, avoid due to potential toxicity
- High doses: May increase clotting risk
Always consult your healthcare provider before starting any supplement.
Vitamin K Calculator. Know Your Intake With Clarity
The Vitamin K Calculator helps you understand how much vitamin k you get from food and supplements in a typical day. Many people underestimate their intake because vitamin k foods are often eaten in small portions or vary by preparation. This tool brings those numbers together in one clear result.
People search for vitamin k benefits, worry about vitamin k deficiency, or ask what is vitamin k and what does vitamin k do. The calculator supports those questions with data instead of guesses.
What the Vitamin K Calculator Does
The Vitamin K Calculator estimates daily intake from foods with vitamin k, vitamin k supplements, and fortified products. It compares your intake to reference targets and flags both low and high ranges.
This matters because vitamin k deficiency symptoms and excess intake can both cause problems. Many users also want to know what is vitamin k good for, how it supports blood clotting, and how it interacts with other nutrients such as vitamin d and k or vitamin d with k combinations.
Who This Calculator Is For
This tool is useful if you • track nutrients for bone or heart health • take a vitamin k supplement or vitamin k 2 product • manage intake while using blood thinners • care for infants and want context around vitamin k newborn needs • want clarity on how much vitamin k per day is appropriate
Parents researching vitamin k shot, vitamin k shot at birth, or vitamin k injection newborn often use this calculator to understand food based intake later in life.
How to Use the Vitamin K Calculator
- Step one is selecting foods you eat regularly. This includes foods high in vitamin k, foods rich in vitamin k, and vitamin k fruits such as leafy greens and avocado. The calculator accounts for avocado vitamin k interaction when portion sizes change.
- Step two is adding supplements if used. Options include vitamin k supplements, vitamin k supplement, or combined products like now foods vitamin d-3 & k-2 reviews often mention.
- Step three is reviewing results. You will see totals based on vitamin k dosage for adults standards and guidance on balance.
Realistic Food Examples
A common lunch might include spinach salad, olive oil, and avocado. These are classic vitamin k rich foods and food rich in vitamin k. Even small servings contribute significantly.
Another example is a dinner with broccoli and roasted chicken. Broccoli is one of the most common foods with vitamin k, while chicken contributes very little. This imbalance is why many users ask what foods have vitamin k or what foods are high in vitamin k.
Packaged foods labeled as vitamin k food or vitamin k food sources can vary widely, which is why the calculator uses average reference values.
What Affects Vitamin K Results
Cooking method matters. Boiled greens may retain less than raw versions. Fat intake also matters because vitamin k function depends on absorption with dietary fat.
Supplement form matters too. Vitamin k vs k2 is a common comparison. Some people use vitamin k 2, others use mixed vitamin k supplements.
Interactions also matter. Pairing vitamin d with k can change how nutrients are used, but does not change the raw intake number shown.
Common Mistakes and Edge Cases
A frequent mistake is confusing is vitamin k potassium. They are not the same.
Another is assuming all greens provide equal amounts. This leads to errors when estimating vitamin k sources or sources of vitamin k.
Parents often confuse food intake with medical prevention. Vitamin k for newborns, vitamin k shot at birth pros and cons, oral vitamin k for newborns, and vitamin k drops for newborns are medical topics. This calculator is not a replacement for neonatal care.
Users on anticoagulants should be cautious. Sudden changes in food with vitamin k can affect medication response.
FAQ
What is vitamin k and why does it matter
What is vitamin k refers to a group of nutrients essential for clotting and bone health. Benefits of vitamin k include proper blood clot formation and support for bone proteins.
What foods contain vitamin k
Common answers include leafy greens, broccoli, and oils. People often ask what food has vitamin k, what foods contain vitamin k, or what has vitamin k when planning meals.
How much vitamin k per day do adults need
Guidelines vary, but the calculator uses standard targets tied to vitamin k dosage for adults.
Can supplements cause side effects
Yes. Vitamin k side effects are uncommon but possible with high supplemental doses.
Is vitamin k2 different
Yes. Vitamin k vs k2 matters because forms behave differently in the body, though both count toward intake totals.
Why do newborns receive vitamin k
Topics like vitamin k shot, vitamin k injection, and vitamin k shot at birth relate to preventing bleeding. The calculator is for dietary tracking, not medical dosing.
Practical Conclusion
The Vitamin K Calculator gives you a realistic picture of intake from vitamin k foods, supplements, and daily habits. It helps answer practical questions about balance, not marketing claims or extremes.
By tracking intake consistently, you reduce the risk of vitamin k deficiency, avoid unnecessary excess, and make informed food choices with confidence.