Vitamin KDoes vitamin K lower blood sugar?
Updated 3 Nov 2026
Short answer
Only a little, in the trials so far. A 2023 meta-analysis of 7 trials with 813 people found small drops in fasting blood sugar and in insulin resistance, but not in fasting insulin.[1] A 2024 meta-analysis of 17 trials found lower insulin resistance (HOMA-IR), but no effect on blood sugar, blood fats, weight or CRP, a marker of inflammation.[2]
In studies that followed 105,798 people, those with more vitamin K had a 21% lower risk of type 2 diabetes.[1] Studies of this kind show a link, not that vitamin K is the cause.[1]
Sources (2)
- The relationship between vitamin K and T2DM: a systematic review and meta-analysis. Qu B, Yan S, Ao Y, Chen X, Zheng X, Cui W Food Funct, 2023. PMID 37724446
- The effect of vitamin K supplementation on cardiovascular risk factors: a systematic review and meta-analysis. Zhao QY, Li Q, Hasan Rashedi M, Sohouli M, Rohani P, Velu P J Nutr Sci, 2024. PMID 38282652
More about vitamin k
What is vitamin K?Which foods contain vitamin K?What is vitamin K used for?Who is at risk of vitamin K deficiency?Is vitamin K safe?Why do newborn babies get vitamin K?For education; not medical advice. Talk to a doctor before you start, stop or change a supplement.