Normal blood clotting
Vitamin K contributes to this process as part of a balanced pattern of nutrients and healthy body function.
Vitamins & Minerals
Vitamin K
This page is for education only and does not diagnose or treat a deficiency. Symptoms can have many causes, and laboratory testing may be needed to confirm a nutrient problem.
What Is This Nutrient?
Vitamin K is a fat-soluble vitamin. The body needs it to carry out essential processes, and an appropriate intake supports normal health without replacing individualized medical care.
Primary Functions
Producing proteins involved in bone health
Vitamin K contributes to this process as part of a balanced pattern of nutrients and healthy body function.
Supporting normal calcium regulation
Vitamin K contributes to this process as part of a balanced pattern of nutrients and healthy body function.
Foods Rich In Vitamin K
Excellent Sources
- Kale
- Spinach
- Collard greens
Good Sources
- Broccoli
- Brussels sprouts
- Soybean oil
Additional Sources
- Natto
- Lettuce
- Cabbage
Food amounts vary by variety, soil, fortification, brand, preparation, and portion size.
Ways To Support Healthy Levels
Eat leafy greens consistently. If you take warfarin, do not make sudden vitamin K intake changes without professional guidance.
A varied eating pattern is usually the best foundation. Supplements can be useful in specific situations, but the right form and dose depend on age, diet, health conditions, medications, pregnancy, and laboratory results.
Possible Signs Of Deficiency
Possible signs may include:
- Easy bruising
- Bleeding concerns
- Reduced bone strength over time
These symptoms can have many causes and do not confirm a deficiency. Consider discussing persistent or concerning changes with a healthcare professional.
Possible Risk Factors For Deficiency
- Newborn age
- Fat-malabsorption disorders
- Long courses of certain antibiotics
- Very limited intake
Restricted diets, digestive disorders, aging, medical conditions, and certain medications can change nutrient needs or absorption. Individual assessment matters.
Possible Signs Or Risks Of Excess Intake
- No established toxicity from food, but vitamin K can significantly interact with warfarin and similar medicines
Food and supplements are not interchangeable sources of risk. Keep supplements away from children and follow product labels and professional advice.
When To Speak With A Healthcare Professional
Persistent Symptoms
Discuss ongoing fatigue, weakness, pain, digestive changes, or other symptoms rather than assuming they come from one nutrient.
Neurological Or Heart Symptoms
Promptly seek care for new numbness, severe weakness, confusion, balance changes, fainting, or heart-rhythm concerns.
Supplement Questions
Ask about the appropriate dose, medication interactions, medical conditions, pregnancy, and whether laboratory testing is useful.
Frequently Asked Questions
Can food provide enough?
Often, yes, but needs and absorption vary. Fortified foods or supplements may be appropriate for some diets, life stages, and medical situations.
Should I take a supplement for symptoms?
Symptoms alone cannot identify a deficiency. A healthcare professional can help evaluate causes, testing, and a safe plan.
Can more be harmful?
Yes. Some nutrients interact with medicines or become harmful at high doses. Avoid assuming that a larger dose is better.
Related Articles
More Vitamin K articles, deficiency guides, food guides, and practical worksheets are coming soon.
Related Resources
Source note: This educational overview is informed by the NIH Office of Dietary Supplements consumer fact sheet for Vitamin K. Consult qualified healthcare professionals for diagnosis, laboratory testing, treatment, or supplement decisions.