Long-term use of antibiotics kills off the bacteria in the intestines that manufacture the vitamin. This can lead to a deficiency, especially if coupled with a diet that doesn't provide enough vitamin K.
Use of mineral oil or medications such as cholestyramine to lower blood cholesterol can interfere with vitamin K absorption. With extended use, this can lead to a deficiency.
Newborn babies, especially those born prematurely, are born with little vitamin K. For the first couple of days after birth, the baby's intestinal tract has no bacteria to make the vitamin. Moreover, the primary source of a baby's nutrition -- milk -- is not a good source of vitamin K. Because the lack of vitamin K could lead to bleeding problems, babies are given a vitamin K supplement within the first couple of days after birth.
©2007 Publications International, Ltd.
Newborns are given vitamin K after birth, when their intestinal
tract has no bacteria to create the vitamin.
- Vitamin A is the vitamin found in carrots that improves eyesight. Learn more about this key vitamin in How Vitamin A Works.
- Vitamin B3, also called niacin, assists other substances in the conversion of protein, carbohydrate and fat into energy. Learn more in How Vitamin B3 Works.
- How Vitamin C Works will show you how this vitamin can strengthen your immune system.
- Discovered only about 60 years ago, Biotin assists in several metabolic reactions. Learn more about it in How Biotin Works.
- Vitamin B12 has a a chemical structure much more complex than that of any other vitamin. Learn about this vitamin How Vitamin B12 Works.
- To learn about the many vitamins in our diet, how much you should be eating, and where to find them, go to our general Vitamins page.
- Find the best prices on vitamin K supplements.