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Vitamins

Vitamin K1

Vitamin K1 supports bone mineralisation and blood clotting — both essential for active individuals. Adequate levels may help reduce fracture risk and support recovery from training.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group
nmol/l
Low 0.8 Normal 5.3 High
Female Your group
nmol/l
Low 0.8 Normal 5.3 High

Source: Clinical Diagnostics Nederland Reference population: Nederlandse volwassenen (Clinical Diagnostics Nederland, serum)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

What It Measures

This test measures the concentration of phylloquinone (vitamin K1) in your blood. It helps assess your vitamin K status and coagulation capacity.

Why It Matters

Vitamin K1 is critical for proper blood clotting and may play a role in bone health. Low levels can be associated with excessive bleeding and may affect bone mineral density. Consult your healthcare provider for personalised interpretation.

When to Test

Testing may be recommended if you bruise easily, experience unexplained bleeding, take blood-thinning medication, or have conditions affecting fat absorption.

Symptoms

Low Levels

Symptoms of low vitamin K1 may include easy bruising, prolonged bleeding from cuts, heavy menstrual periods, and blood in urine or stool. Severe deficiency can impair coagulation.

High Levels

Vitamin K1 toxicity from food sources is extremely rare. However, high intake may interact with blood-thinning medications. Discuss any supplementation with your healthcare provider.

Lifestyle Tips

Eat plenty of green leafy vegetables such as kale, spinach, and broccoli. Consistent vitamin K intake is particularly important if you are on blood-thinning medication — discuss dietary changes with your healthcare provider.

Frequently Asked Questions

What is the difference between vitamin K1 and K2?
Vitamin K1 is found mainly in leafy greens and is primarily involved in blood clotting. Vitamin K2 is found in fermented foods and animal products and may play a greater role in bone and cardiovascular health.
Can vitamin K affect my blood-thinning medication?
Yes, vitamin K can interact with certain blood-thinning medications. Maintain a consistent intake and consult your healthcare provider about any dietary changes.
How much vitamin K1 do I need daily?
Daily needs vary by age and sex. Your healthcare provider can advise you on the appropriate intake based on your individual health profile.

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