Vitamin K2 is a fat-soluble, vitamin-derived compound (primarily menaquinones such as MK-4 and MK-7) that functions as an essential cofactor for the vitamin K–dependent carboxylation of specific proteins. The most established clinical link is its requirement for proper post-translational activation of coagulation factors (notably in the liver) and for activation of proteins involved in mineralization, such as matrix Gla protein (MGP) and osteocalcin. However, beyond bone biology, vitamin K2 is increasingly studied for its potential effects on chronic inflammation, insulin sensitivity, and sex-hormone–related pathways.
Mechanistically, vitamin K2 participates in the vitamin K cycle by acting as an electron acceptor for the enzyme gamma-glutamyl carboxylase. This enables carboxylation of glutamate residues (forming gamma-carboxyglutamate, or Gla) on target proteins. Inadequate vitamin K status leads to undercarboxylated forms of these proteins, which can impair regulatory roles at vascular, metabolic, and tissue levels. In particular, MGP requires carboxylation to inhibit inappropriate calcification; vascular calcification and endothelial dysfunction are tightly coupled to inflammatory signaling, oxidative stress, and metabolic dysregulation.
Inflammation: Chronic low-grade inflammation is driven by cytokine networks (e.g., TNF-α, IL-6), innate immune activation, and downstream effects on insulin signaling. Vitamin K2 may influence inflammation by modulating vascular calcification and by affecting pathways related to endothelial function and oxidative stress. Additionally, activated proteins may help regulate local tissue microenvironments, potentially reducing inflammatory triggers related to ectopic mineral deposition. While observational studies often associate higher vitamin K intake with lower inflammatory markers and reduced cardiovascular risk, causality in randomized controlled trials remains an active research area.
Glucose balance and insulin sensitivity: Insulin resistance is characterized by impaired insulin signaling in skeletal muscle and liver, chronic inflammation, altered adipokine profiles, and mitochondrial dysfunction. Vitamin K2 has been investigated as a modulator of metabolic processes, potentially through effects on vascular health (improving microcirculatory function), attenuation of calcification-related tissue stress, and interactions with signaling cascades influenced by oxidative stress. Some clinical trials suggest that vitamin K (including K2) may improve aspects of glycemic control, but results vary by dose, baseline vitamin K status, population, and study design. Therefore, vitamin K2 should not be viewed as a stand-alone therapy for diabetes; rather, it is best considered a supportive nutrient that may complement dietary patterns emphasizing adequate micronutrients, fiber, and cardiometabolic risk reduction.
Testosterone and energy-related effects: Sex-hormone metabolism is influenced by endocrine regulation, inflammation status, body composition, sleep quality, and micronutrient sufficiency. Vitamin K2’s direct role in testosterone synthesis has not been definitively established in large, high-quality trials. Nonetheless, plausible indirect mechanisms include improved metabolic health (which can influence the hypothalamic-pituitary-gonadal axis), reduction of inflammation-related suppression of reproductive hormones, and effects on vascular function that may influence tissue nutrient delivery. Reports linking vitamin K2 with testosterone and energy are therefore best interpreted as hypothesis-generating rather than conclusive. For individuals with true hypogonadism, evaluation of total and free testosterone, SHBG, LH/FSH, prolactin, thyroid function, and contributing comorbidities remains essential.
Dietary sources and absorption: Vitamin K2 is found in fermented foods and certain animal products. Natto (fermented soy) is exceptionally rich in MK-7. Other sources include fermented dairy products (with variable MK content), egg yolk, and some meats. Absorption improves with dietary fat, bile flow, and overall nutritional status. Because vitamin K is fat-soluble, low-fat diets or malabsorption syndromes can increase deficiency risk. Additionally, prolonged use of antibiotics and certain gastrointestinal disorders may reduce gut-derived vitamin K contributions (primarily K1 and some menaquinones), though the clinical relevance varies.
Safety and interactions: The most critical clinical consideration is interaction with vitamin K antagonists (notably warfarin). Vitamin K2 can reduce the anticoagulant effect of warfarin, increasing thrombotic risk; any supplementation must be managed through the prescriber with consistent dietary vitamin K intake. General tolerability is good at typical supplemental doses in studies, but unnecessary high dosing should be avoided, particularly in patients with coagulopathies or on anticoagulation.
Clinical takeaways: Vitamin K2 is best understood as a nutrient essential for activating vitamin K–dependent proteins that regulate mineralization and vascular biology. Through these pathways, it may contribute to reduced inflammation and support healthier glucose metabolism and endocrine function indirectly. The current evidence is strongest for roles in calcification biology; for glycemic control and testosterone/energy outcomes, evidence is promising but not yet definitive. A rational approach is ensuring adequate intake via diet, considering supplementation only when appropriate, and integrating vitamin K2 into broader cardiometabolic and lifestyle strategies.
Source: @dr_ericberg
Dr. Eric Berg DC: Vitamin K2 does much more than support your bones. It helps lower inflammation, improves blood sugar balance, and may even support healthy testosterone levels and energy. See the top foods to eat and why K2 matters far more than you think. Dr. Eric. #breaking
— @dr_ericberg May 1, 2026
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