America's Compounding Center says the following about Vitamin K1:
"Vitamin K1, also known as phytonadione or phylioquinone, is a fat-soluble vitamin that plays an important role in producing specific chemicals in the liver that allow blood to clot. Fat-soluble vitamins are stored by the body and do not need to be replaced daily through dietary consumption. Dietary sources of vitamin K1 include green leafy vegetables, such as spinach, broccoli, and kale. Vitamin K1 is commonly administered in newborns to prevent bleeding, and is also used to reverse the effects of the anticoagulant medication, Warfarin. Causes of vitamin K1 deficiency include malabsorption syndromes, genetic defects, liver disease, bowel resections, and poor dietary intake. Vitamin K1 deficiency may cause unusual bleeding or easy bruising. Common doses of oral vitamin K1 supplementation range from 1-25 mg daily. Potential side effects include jaundice and allergic reactions, such as rash, hives, and airway constriction."