Vitamin K2 (MK-7): evidence, dose and safety
Vitamin K2 is a group of menaquinones made by bacteria and found in fermented foods such as natto and some cheeses. We use menaquinone-7 (MK-7), which stays in the blood longer than the shorter forms.
At a glance
- Strongest evidence
- D Weak
- Dose in our plans
- 100 µg a day for adults
- Safety checks
- 0 situations and 1 medicine or supplement interaction, checked against your answers in every plan
- Reviewed
- Atrum Labs clinical team (MD, PhD), November 2026
Authorised EU health claim
Vitamin K contributes to the maintenance of normal bones.
What the research looked at
Each line is one body of research, graded A (strong) to D (weak). How we grade evidence. What each study measured is explained in your personal plan.
| Grade | Who was studied | References |
|---|---|---|
| D | Adults with osteoporosis |
|
How much
- Our plans usually use 100 µg a day for adults. The exact dose depends on your lab results, age and medicines.
- Children's doses are set by age, and some ingredients are for adults only.
Medicines and other supplements
- Not suitable. Vitamin K antagonizes warfarin and other vitamin K antagonists.
Your plan is checked against every medicine you tell us about. If you take a medicine, ask your pharmacist or doctor before starting a new supplement.
Written and reviewed by the Atrum Labs clinical team (physician-scientists, MD, PhD) from our clinical knowledge base, version 0.2.0-draft. This page is general information, not medical advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle.
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