Trial reportEuropean journal of clinical nutrition2021
Vitamin K2 (menaquinone-7) increases plasma adiponectin but does not affect insulin sensitivity in postmenopausal women: a randomized controlled trial.
Trial report in European journal of clinical nutrition, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
7 citing papers in PubMed, 1 synthesis or guideline pooled it, 6 citations in OpenAlex.
- The effect of vitamin K supplementation on cardiovascular risk factors: a systematic review and meta-analysis.Journal of nutritional science · 2024Pooled it
- Sex-Specific Effects of Menaquinone-7 (MK-7) Supplementation on Body Composition and Adiposity Markers.Nutrients · 2026Article
- Associations between maternal circulating vitamin K isoforms and adverse pregnancy events.BMC pregnancy and childbirth · 2026Article
- Vitamin K as an Endocrine Modulator: Mechanistic Links to Glucose Metabolism and Beyond.Nutrients · 2026Review
- Osteocalcin Beyond Bone: Molecular Mechanisms, Endocrine Networks, and Translational Perspectives Across Metabolism, Neurobiology, and Chronic Disease.International journal of molecular sciences · 2026Review
- Review
- Vitamin K2 protects mice against non-alcoholic fatty liver disease induced by high-fat diet.Scientific reports · 2024Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND/
objectivesVitamin K is a co-factor in the carboxylation of the bone matrix protein osteocalcin (OC), and thus decreases the concentration of undercarboxylated osteocalcin (ucOC). Animal and in vitro studies suggest that ucOC increases insulin sensitivity. However, epidemiological studies find positive associations between vitamin K intake and insulin sensitivity. We aimed to investigate the effect of vitamin K2 in the form of menaquinone-7 (MK-7) on serum ucOC, bone mass, and insulin sensitivity in postmenopausal women. SUBJECTS/
methodsThis was a randomized placebo-controlled trial. One hundred forty-eight postmenopausal women received MK-7 375 µg daily or placebo, as an add-on to calcium (800 mg) and vitamin D (38 µg) for 12 months. We measured serum ucOC, insulin sensitivity by HOMA-IR, and plasma adiponectin and leptin at baseline and after 12 months.
resultsS-ucOC decreased in the MK-7 group (-70.3 (-75.6; -63.8) %) compared to the placebo group (-7.2 (-15.9; 2.0) %) after 12 months (p < 0.01). P-adiponectin increased in the MK-7 group (6.1 ± 20.1%) (mean ± SD) compared to the placebo group (-0.7 ± 15.5%) after 12 months (p = 0.03). HOMA-IR and p-leptin did not change in the two groups.
conclusionTreatment with MK-7 for 12 months decreased p-ucOC, increased p-adiponectin, but did not change insulin sensitivity suggesting that ucOC does not affect insulin sensitivity in healthy postmenopausal women.
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