Vitamin K is an essential fat-soluble micronutrient which is needed for a unique posttranslational chemical modification in a small group of proteins with calcium-binding properties, collectively known as vitamin K – dependent proteins or Gla-proteins. Thus far, the only unequivocal role of vitamin K in health is in the maintenance of normal coagulation. Some studies suggest that it helps maintain strong bones in the elderly.
Vitamin K (phytonadione) daily dose
|Age||Vitamin K (phytonadione)
|0 - 6 months||5 (m)|
19 - 65 years
|65 + years Males||65|
|65 + years Females||55|
(l) The RNI for each age group is based on a daily intake of 1 μg/kg/day of phylloquinone, the latter being the major dietary source of Vitamin K.
(m) This intake cannot be met by infants who are exclusively breast-fed. To prevent bleeding due to vitamin K deficiency, all breast fed babies should receive vitamin K supplementation at birth according to nationally approved guidelines.
Vitamin K (phytonadione) Food sources: green leafy vegetables, such as kale, spinach, turnip greens, collards, Swiss chard, mustard greens, parsley, romaine, and green leaf lettuce, vegetables such as brussels sprouts, broccoli, cauliflower, and cabbage, fish, liver, meat, eggs, and cereals (contain smaller amounts).