Vitamin K

Vitamin K Basics

Vitamin K is necessary for blood clotting, specifically the production of prothrombin, a plasma protein. Additionally, it is needed for bone formation and building osteocalcin, an important protein in bone tissue. Vitamin K may help to prevent osteoporosis by increasing bone mass (especially in postmenopausal women).

In some cases, Vitamin K is given to reduce the risk of bleeding during or after long-term use of antibiotics or aspirin. Extended use of antibiotics can devastate friendly bacteria in the intestines. Vitamin K's clotting qualities benefit women under treatment for heavy menstrual bleeding. Even premature babies at risk for bleeding may be given an injection of Vitamin K following birth.

The benefits from Vitamin K include the prevention of kidney stones and some organ cancers.

Dosage Guidelines

The recommended dietary allowances are as follows:

• Adult Men - 80 mcg
• Adult Women - 65 mcg

As with any medication, consult a medical professional before giving Vitamin H to a child. See additional 'Cautions' below.

Sources

Significant amounts of Vitamin K are found in the following foods: green tea, turnip greens, dark green leafy vegetables, egg yolks, and chlorophyll. Cooking foods does not destroy Vitamin K, however freezing does.

Many forms of Vitamin K are available (synthetic and natural). It is found in multivitamin formulas and in 5-mg tablet form. Water-soluble chlorophyll is most common and available without a prescription. This form is quite useful to reduce body odor.

Cautions

If anticoagulant medications (blood thinners such as Coumadin or Warfin) are taken, consult a medical professional prior to taking Vitamin K.

Vitamin E inhibits the body's ability to absorb Vitamin K (aids in blood clotting), which may increase the risk of abnormal bleeding.

Pregnant women and nursing mothers should speak to a medical professional prior to taking Vitamin K. Not only is the vitamin excreted in breast milk, but crosses the placenta.

The following increases the body's need for Vitamin K: radiation therapy, long-term use of antibiotics and/or aspirin, phentoin, cholestryamine, and mineral oil laxatives.

Although Vitamin K is generally nontoxic, if taking prescription medications, seek the advice of a medical professional first.