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Vitamin K2 (Menaquinone)
Fat-soluble vitamin that directs calcium to bones instead of arteries, supporting cardiovascular and bone health.
What the evidence says
Vitamin K2 appears to help in 10 of 12 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 2004–2026 with a typical study size of 156 participants.
Based on 46 studies · 12 meta-analyses · 23 RCTs · 254,449 total participants
Confidence
HighWhat the studies found
By outcome
See full supplement plans that include Vitamin K2.
Vitamin K2 has an evidence score of 7.5/10 — strong evidence based on 46 indexed studies, including 12 meta-analyses. Fat-soluble vitamin that directs calcium to bones instead of arteries, supporting cardiovascular and bone health.
The commonly studied dose of Vitamin K2 is 100-200mcg (MK-7). Research points to an estimated optimal dose around 180mcg, with a minimum effective dose near 90mcg. Individual response varies — start low and adjust.
The best time to take Vitamin K2 is with meals. Take it with food. Vitamin K2 (menaquinone) is a fat-soluble vitamin essential for activating matrix Gla protein (MGP, prevents arterial calcification) and osteocalcin (directs calcium into bones).
Beta-Sitosterol
Likely helpsPlant sterol that reduces BPH urinary symptoms in clinical trials and blocks intestinal cholesterol absorption.
Vitamin D3
Probably helpsHormone-like vitamin that regulates 1,000+ genes — deficiency is widespread and linked to poor immunity, depression, and bone loss.
Last reviewed May 2026 · evidence from 39 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Vitamin K2 activates proteins that regulate calcium metabolism, directing calcium into bones and teeth while keeping it out of arteries and soft tissues. MK-7 is the most bioavailable form. Essential when supplementing vitamin D and calcium. Most people don't get enough from diet alone.
Activates the protein that binds calcium to bones
Keeps calcium out of blood vessels
How Vitamin K2 works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
100-200mcg (MK-7)
Take with food
| Form | Type |
|---|---|
| 💊MK-7 (menaquinone-7) | Recommended |
| 💊MK-4 (requires higher doses, multiple times daily) | Alternative |
MK-7 has longer half-life (72 hours vs 6 hours for MK-4) and is effective at lower doses.
Minimum: 12 weeks
Optimal: weeks
Cycling: Not required
Note: Fat-soluble, so take with food containing fat for absorption. Often paired with vitamin D3.
You can get vitamin k2 from these foods and drinks. Doses are typical per-serving estimates — actual content varies by brand, brew, cooking, etc.
850 mcg per serving
One ~40 g serving. By far the densest source of MK-7 (the long-acting K2 form). Acquired taste.
25 mcg per oz
1 oz. Aged hard cheeses (Gouda, Edam, Parmesan) carry the most MK-7/MK-9.
Based on meta-analyses showing 2.17% WMD improvement in lumbar BMD. Effects primarily demonstrated with MK-7 form in postmenopausal women. Combination with vitamin D3 may enhance effects.
Supports bone density when combined with D3 and calcium
May reduce arterial calcification over time
Likely safe at recommended doses; supports fetal bone development
Contraindicated with warfarin, heparin, and other anticoagulants without medical supervision. Vitamin K2 directly antagonizes the mechanism of these medications, potentially causing dangerous clot formation. Requires INR monitoring and physician approval.
Vitamin K2 promotes clotting factors that warfarin is designed to inhibit. Taking K2 can significantly reduce anticoagulant effectiveness, increasing risk of dangerous blood clots. Requires medical supervision and INR monitoring if used together.
Consult doctor before combining
Tip: N/A
D3 increases calcium absorption; K2 directs it properly
Essential pairing for bone health and preventing soft tissue calcification
Magnesium also supports proper calcium metabolism
Comprehensive mineral and calcium regulation support
Vitamin K2 activates matrix Gla protein (MGP) and osteocalcin, directing calcium into bones and preventing arterial calcification from supplemental calcium.
Calcium gets deposited into bone rather than arterial walls, improving cardiovascular safety of calcium supplementation
MVIs typically contain vitamin K1; K2 (MK-7) has distinct roles in directing calcium to bones rather than arteries. Combining both forms ensures comprehensive vitamin K activity.
Enhanced bone mineral density and cardiovascular protection via optimized calcium metabolism
Vitamin K2 is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are none commonly reported. Use caution if any of these apply to you: Those taking warfarin or other vitamin K antagonists (consult doctor); Anticoagulant or blood thinner therapy (warfarin, heparin, Coumadin) — Vitamin K2 directly antagonizes warfarin's mechanism of action.
Vitamin E
Likely helpsLipid-soluble antioxidant that shields cell membranes from oxidative damage — natural mixed tocopherols preferred over synthetic forms.
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