How much vitamin K do I need per day?

Adequate intake is commonly set at 120 mcg per day for adult men and 90 mcg per day for adult women.

What foods are highest in vitamin K?

Leafy greens are the biggest drivers, along with vegetables like broccoli and Brussels sprouts. Some fermented foods contain vitamin K2.

What is the difference between vitamin K1 and K2?

Vitamin K1 is common in leafy greens. Vitamin K2 includes several forms found in some fermented foods and some animal foods. Both are part of the vitamin K family.

Do blood thinners interact with vitamin K?

Yes, especially warfarin. The practical rule is consistency. Do not drastically change your vitamin K intake without clinician guidance.

Can you get too much vitamin K?

No tolerable upper limit has been set for vitamin K from food. Supplement decisions are different, especially if you take anticoagulants.

Is vitamin K important for bones?

Vitamin K supports proteins involved in bone health. It is not a magic fix. The practical goal is consistent intake from vegetables in a balanced diet.

Should I take a vitamin K supplement?

Most people do not need one. If you take anticoagulants or have medical conditions, ask a clinician before supplementing.

What is the easiest vitamin K strategy this week?

Pick one leafy green you will repeat and add it to one meal most days. Use a little fat (like olive oil) for absorption. If you take warfarin, keep intake stable.

Vitamin K

Vitamin K helps your blood clot normally and also supports proteins involved in bone health. Most people get enough when they regularly eat leafy greens and vegetables. The main vitamin K issue is not "low K", it is inconsistency when someone takes blood thinners like warfarin. If you are on these meds, the goal is steady intake, not avoiding vitamin K.

Supports normal blood clotting
Supports proteins involved in bone health
Often easy to hit when you eat leafy greens regularly
Consistency matters if you take warfarin or other vitamin K related medications
Food sources are usually safer than high-dose supplements without a plan

Try BeyondCal for free

How BeyondCal helps you track vitamin K

Track vitamin K automatically from logged foods and meals
See your rolling average over time after you log food
See how far you are from your daily target
Find which meals contribute most to your vitamin K intake

Exact values and your gap are shown in the app after you log food.

See this in the app

What this helps with

What works with vitamin K

Vitamin D and calcium are often tracked alongside vitamin K when people focus on bone-related nutrition
Dietary fat helps absorption of vitamin K from vegetables
Magnesium often supports the same whole-food pattern that improves vitamin K intake

Playbook

Raise it fast

Fastest ways to raise vitamin K with food

Add one leafy green serving most days (spinach, kale, romaine, arugula)
Use a cooked green side a few times per week (cooked greens often make it easier to get a meaningful amount per meal)
Add broccoli or Brussels sprouts as repeatable dinner sides
If you eat fermented foods, some options contain vitamin K2 (for example natto is very high, while some cheeses contain smaller amounts)
If you take blood thinners, do not change vitamin K intake aggressively. Keep it consistent and talk to your clinician

Food swaps

Simple swaps that make vitamin K automatic

No vegetables at lunch -> add a side salad or greens in the sandwich or bowl
Plain pasta -> add a spinach or kale mix-in
Takeout dinner -> add a quick microwave broccoli side
Snack foods -> veggies plus hummus instead of chips
Skipping greens all week -> pick one green you will repeat and make it a default

Timing tips

Practical vitamin K rules

Vitamin K is fat-soluble, so greens work better when meals include some fat (olive oil, eggs, dairy, nuts, avocado)
If you are on warfarin, your goal is stable intake. Do not swing from zero greens to huge salads overnight
If you take antibiotics long term or have gut or absorption issues, ask a clinician if vitamin K monitoring matters
Supplements are not a casual add-on if you use anticoagulants. Get guidance first

Absorption blockers and interactions

What can block or reduce absorption

What can create problems or confusion

Warfarin interacts with vitamin K. The issue is inconsistent intake, not vegetables
Very low-fat diets can reduce absorption of vitamin K from food
Fat malabsorption conditions can reduce vitamin K status and need medical guidance
High-dose vitamin K supplements can interfere with anticoagulant therapy. Do not self-prescribe

If you eat like this, watch out

You should pay extra attention if

You rarely eat vegetables, especially leafy greens
You follow a very low-fat diet long term
You have digestive conditions that affect fat absorption
You take warfarin or other anticoagulants. In this case, keep intake consistent and follow clinician guidance
You take multiple supplements and might be adding vitamin K without noticing

Track together

Vitamin K is most useful with calcium and vitamin D because these often move together in bone-focused nutrition. Tracking fat helps because vitamin K absorption depends on fat. If you take anticoagulants, tracking helps you keep intake consistent instead of guessing.

Related nutrients

FAQ

Sources

Disclaimer: Educational only, not medical advice. Talk to a qualified clinician for personal guidance.

Read full disclaimer

The information provided is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Individual nutrient needs vary by age, sex, health status, medications, and other factors. Vitamin K can interact with anticoagulant medications, especially warfarin, where consistent intake is important. If you take blood thinners, have fat malabsorption issues, take medications, or are considering supplements, consult a qualified healthcare provider. BeyondCal helps you track intake from food logs, but it does not replace professional medical advice.