Editorial The key question of vitamin K nutrition in humans may be how much is enough. As with other vitamins, the answer could depend on which biological effect is observed. Vitamin K was first discovered as an antihemorrhagic factor, and it is now known to be required for the synthesis of several proteins involved in blood coagulation (prothrombin; Factors VII, IX, and X; proteins S and C). O...

vitamin d deficiency is one of the most preventable challenges worldwide. the aim of this study was to determine the prevalence of vitamin d deficiency among female nurses working at children’s medical center hospital in tehran, iran, due to the risk factor of being a notably long period indoors and the fact that their health status may have consequences on the process of patients’ treatment. a...