disorders of nutrition
Vitamin K Excess
Introduction
Vitamin K toxicity is rare but is most common in formula-fed infants. Vitamin K has two forms: Phylloquinone:This form occurs in plants and is consumed in the diet. It is absorbed better when it is consumed with fat. Phylloquinone is not toxic, even in large amounts. Menaquinone:This form is produced by bacteria in the intestine, but only small amounts of it are produced. In some countries, this form is used for supplementation. Vitamin K is necessary for normal blood clotting. It is also needed for healthy bones and other tissues. The effects of vitamin K toxicity can include Overview of Anemia due to rupture of red blood cells and (See also Overview of Vitamins .) 