Vitamin K deficiency might reduce bone strength and increase the risk of getting osteoporosis because the body needs vitamin K for healthy bones. Severe vitamin K deficiency can cause bruising and bleeding problems because the blood will take longer to clot. What happens if I don't get enough vitamin K? People who have had bariatric (weight loss) surgery.People with conditions (such as cystic fibrosis, celiac disease, ulcerative colitis, and short bowel syndrome) that decrease the amount of vitamin K their body absorbs.Newborns who don’t receive an injection of vitamin K at birth.However, certain groups of people may have trouble getting enough vitamin K: Also, bacteria in the colon make some vitamin K that the body can absorb. Most people in the United States get enough vitamin K from the foods they eat. Common forms of vitamin K in dietary supplements are phylloquinone and phytonadione (also called vitamin K1), menaquinone-4, and menaquinone-7 (also called vitamin K2). Vitamin K is also available in supplements of vitamin K alone or of vitamin K with a few other nutrients such as calcium, magnesium, and/or vitamin D. Vitamin K is found in multivitamin/multimineral supplements. You can find links to more food sources of vitamin K in the last section of this fact sheet, Where can I find out more about Vitamin K? What kinds of vitamin K dietary supplements are available?
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