The only way to prevent the deficiency of Vitamin K is by having a diet that has the essential quantity of Vitamin K. The main sources of Vitamin K are foods like spinach, cabbage, Brussels sprouts, eggs, soybean oil, canola oil and olive oil. Elderly people in particular, should keep a watch and have sufficient intake of this vitamin in their diet. In newborns, this deficiency is treated by giving an injection of 5 mg of the prescribed drug. Adults who suffer from Vitamin K deficiency are prescribed oral medicines for a defined period of time, depending on the individual and the severity of the condition.