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Vitamin K slowed the development of insulin resistance in elderly men in a study of more than 350 men and women ages 60 to 80.
Among those in the study given vitamin K, both men and women took daily multivitamins containing 500 micrograms of vitamin K, five times the recommended Adequate Intake (AI). They also received a calcium and vitamin D supplement. Men and women in the control group received no vitamin K supplementation but did receive the multivitamin and the calcium and vitamin D supplement.
Men who received vitamin K supplementation had less progression in their insulin resistance. However, progression in insulin resistance was observed both in women who received vitamin K supplementation, and in the men or women who were not given vitamin K supplements.
In addition to improved insulin resistance, the supplemented men had lower blood insulin levels compared to the unsupplemented men at the conclusion of the study.
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