How strong is the evidence behind Vitamin K2 and Vitamin K2 MK-4 for this claim?

NutriStack rates this as Emerging evidence, meaning early RCT signal, mechanistic data, or limited human evidence. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.

What contrary evidence or caveats apply?

Most calcification data comes from rodent and observational studies. Hard cardiovascular outcomes are not yet established.

Show your sourcesEmerging evidenceReviewed May 2026

Vitamin K2 may reduce arterial calcification, the receipts.

Mechanism (activation of matrix Gla protein) is well-established. Clinical evidence for reversing or slowing arterial calcification in humans is suggestive but not yet conclusive.

4 of 4 matching studies surfaced. NutriStack rating: emerging evidence. Last reviewed May 26, 2026.

How we tier evidence →Browse all claim deep dives

Emerging evidence, per the methodology. Strongest 4 studies linked to PubMed.
Recommendation, contrary evidence, and dose are all on this page.

The studies·Contrary evidence·Recommendation

The studies

Strongest evidence, sourced.

Sorted by study tier (meta-analyses first, then RCTs, then reviews) and recency. Every entry links to PubMed by PMID.

At a glance

Substances: Vitamin K2, Vitamin K2 MK-4
Evidence tier: Emerging evidence
Strongest studies surfaced: 4 of 4 matching
One-line verdict: Mechanistically compelling, clinically unproven.
Last verified: May 30, 2026

Top 4 studies

RCT Bladbjerg EM, Levy-Schousboe K, Frimodt-Møller M et al., Journal of renal nutrition : the official journal of the Council on Renal Nutrition of the National Kidney Foundation 2024

No Detectable Coagulation Activation After Vitamin K (MK-7) Supplementation in Patients on Dialysis With Functional Vitamin K Deficiency: A One-Year Randomized, Placebo-Controlled Study PMID 38128853
RCT Naiyarakseree N, Phannajit J, Naiyarakseree W et al., Nutrients 2023

Effect of Menaquinone-7 Supplementation on Arterial Stiffness in Chronic Hemodialysis Patients: A Multicenter Randomized Controlled Trial PMID 37299386
RCT Caluwé R, Vandecasteele S, Van Vlem B et al., Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association 2014

Vitamin K2 supplementation in haemodialysis patients: a randomized dose-finding study PMID 24285428
Review Mandatori D et al., Nutrients 2021

The Dual Role of Vitamin K2 in 'Bone-Vascular Crosstalk': Opposite Effects on Bone Loss and Vascular Calcification PMID 33917175

Vitamin K2 deficiency may be responsible for the 'calcium paradox', low calcium in bone and accumulation in vessel walls; K2 activates both osteocalcin and MGP

Contrary evidence

What pushes back.

Caveats, null findings, and methodological limits that hold the tier where it is.

What argues against the claim

Most calcification data comes from rodent and observational studies.
Hard cardiovascular outcomes are not yet established.

Recommendation

What the evidence supports.

What we recommend, with caveats

180 mcg/day MK-7 alongside vitamin D is reasonable if you supplement higher-dose D3, but do not expect this to reverse existing coronary calcification.

Tier criteria are documented at /methodology/evidence-tiers. Sourcing standards at /methodology/interactions.

Stack interaction risks

Where these substances clash.

Documented pairings involving the substances behind this claim. Cautions and conflicts come first.

Pairs in the database

Open the free interaction checker at /interactions to scan a full routine.

Goal hubs

Where this claim feeds in.

Goal-based hubs that index this claim alongside related supplements and protocols.

Related goal hubs

Heart & Cardiovascular

Before you go

One claim, opened up. NutriStack does this for every claim in the database.

The full library lives at /research. Every entry follows the same shape: the verdict, the studies, the contrary evidence, the recommendation, and the primary literature.

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