Vitamin K2 supplementation reduces dp-ucMGP but not dp-cMGP levels in dialysis patients. Vitamin K2 supplementation reduces dp-ucMGP but not dp-cMGP levels in dialysis patients. Plasma levels of dp-ucMGP and dp-cMGP at baseline and after 6 weeks of treatment with vitamin K2 (135 μg MK-7). (A) Changes in dp-ucMGP levels (**P < 0.01), whereas B depicts dp-cMGP levels (not significant) before (baseline) and after vitamin K2 substitution (vit K2), respectively. Georg Schlieper et al. JASN 2011;22:387-395 ©2011 by American Society of Nephrology