NSTK · 01.2026Independent supplement reference
NutriStack
Edition 1.0Updated August 1, 2026

Supplement × Supplement·Evidence index

Calcium and Vitamin K2: what the published research says

PubMed indexes 5 records that name Calcium and Vitamin K2 together, either in the title or in an interaction, co-administration, or pharmacokinetic context. Each one is listed below with its study design and, where the abstract states one, the authors’ own conclusion, quoted and linked. This page reports that literature. It does not tell you whether to combine them.

Read this first

An evidence index, not guidance.

Every statement below is attributed to a named, dated, linked source.

This page lists published research relevant to Calcium and Vitamin K2. It deliberately does not state whether the combination is safe, whether it interacts, in which direction, at what dose, or how far apart to take them.

The research

5 studies naming Calcium and Vitamin K2.

Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.

Proper Calcium Use: Vitamin K2 as a Promoter of Bone and Cardiovascular Health.

Integrative medicine (Encinitas, Calif.) · 2015 · PMID 26770129

Review

“Vitamin K deficiency results in inadequate activation of MGP, which greatly impairs the process of calcium removal and increases the risk of calcification of the blood vessels. An increased intake of vitamin K2 could be a means of lowering calcium-associated health risks.”

Maresz · From the abstract

Names both Calcium and Vitamin K2 in its title.

Something more to say about calcium homeostasis: the role of vitamin K2 in vascular calcification and osteoporosis.

European review for medical and pharmacological sciences · 2013 · PMID 24089220

ReviewHuman subjects

“Vitamin K2 deficiency has recently been recognized as a protagonist in the development of vascular calcification and osteoporosis. Data reported so far are promising and, dietary supplementation seems a useful tool to contrast these diseases. However, large studies or solid clinical correlations regarding vitamin K2 deficiency and its pathologic consequences are needed to confirm these preliminary experiences.”

Flore et al. · Authors' conclusion

Names both Calcium and Vitamin K2 in its title.

Advances in the management of osteopenia: a case series.

Journal of medical case reports · 2026 · PMID 41709348

Case ReportsHuman subjects

“Despite the preliminary nature of the obtained data, combined supplementation exerted positive effects on bone metabolism by influencing serum levels of both vitamin D and osteocalcin, thus suggesting enhanced bone formation. Biochemical improvements support the potential of D-chiro-inositol and α-lactalbumin, in addition to traditional supplements, as a therapeutic strategy for managing osteopenia, even though further clinical studies are needed to clarify the effects and…”

Nordio et al. · Authors' conclusion

Names Calcium and Vitamin K2 together in an interaction, co-administration, or pharmacokinetic context.

Limitations

What this evidence cannot tell you.

Search-based evidence indexes have real limits, and it is worth being explicit about them:

NutriStack

Track what you actually take.

NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers Calcium, Vitamin K2, and several hundred other substances.

The checker is a research and organisation tool, not a clinical decision aid, and its per-pair assessments are excluded from search until they pass claim-level review.

NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.