VITAMINS
Vitamin K2 (menaquinone-7)
Vitamin K2 (MK-7) supports normal blood clotting and helps direct calcium to bones.
Also known as: menaquinone-7, MK-7, menaquinone, vitamin K
At a glance
- Form
- Menaquinone-7
- Category
- Vitamins
- In an apiece formula
- 180 mcg a day (you can change it)
- Recommended intake
- 90 mcg (women), 120 mcg (men) (adequate intake)
- Upper limit
- No established UL
- Studied for
- Heart & metabolic health*
- Reference
- NIH ODS: Vitamin K fact sheet
What the research says
In 244 healthy postmenopausal women, 180 mcg of MK-7 a day for 3 years slowed bone loss.*
RCT (placebo-controlled) · 244 · Knapen MH, Osteoporos Int 2013. Read the study on PubMed
Who should be careful
Our safety rules leave vitamin K2 out of a formula, or keep the amount lower, with:
Medicines and supplements
- Warfarin
- Other blood thinner
Procedures
- Surgery
- Dental surgery
- Cosmetic surgery or injections
- Biopsy, epidural, nerve block or joint injection
- Egg retrieval, embryo transfer or egg freezing
Life stage
- Pregnancy
- Breastfeeding
- Trying to conceive
Always check with your doctor or pharmacist before adding a supplement if you take medication, are pregnant or nursing, or have a health condition. Stay under the upper limit from all sources combined, including multivitamins.
Symptoms it’s studied for
- Tired or low energy
- Joint aches or stiffness
- Catching every cold
- Hair shedding
- Skin issues (acne, dry, eczema)
- Muscle cramps or twitches
From the Journal
- How much vitamin D should you take a day?
The RDA, the 4,000 IU upper limit, IU vs mcg, D3 vs D2, what a 25-hydroxyvitamin D test means, taking it with a meal, the honest evidence on K2, and who should be careful.
- Which supplements interact with common medications?
The best-documented supplement and medicine interactions, from vitamin K and warfarin to St. John's wort, minerals and thyroid medicine, and 5-HTP with SSRIs.
Questions
How much vitamin K2 a day?
apiece formulas usually include 180 mcg a day. The recommended intake for adults is 90 mcg (women), 120 mcg (men) (adequate intake). Upper limit: No established UL.
What is vitamin K2 used for?
Vitamin K2 (MK-7) supports normal blood clotting and helps direct calcium to bones. In apiece it is part of formulas for Heart & metabolic health.*
Who should be careful with vitamin K2?
apiece’s safety rules leave it out or limit it with: Warfarin; Other blood thinner; Surgery; Dental surgery; Cosmetic surgery or injections; Biopsy, epidural, nerve block or joint injection; Egg retrieval, embryo transfer or egg freezing; Pregnancy; Breastfeeding; Trying to conceive. Check with your doctor or pharmacist if any apply to you.
Can I get vitamin K2 in a personalized supplement?
Yes. apiece builds one daily blend around your goals and, if you have them, your lab results. Vitamin K2 can be part of it at the amount listed, with every ingredient shown and never more than 10 capsules a day.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is general information, not medical advice. Check with your doctor or pharmacist before starting a supplement, especially if you take medication, are pregnant or nursing, or have a health condition. Updated 2026-10-21.