Who should take vitamin K1?

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Vitamin K1 is intended for people who have vitamin K1 deficiency or certain blood clotting problems.

  • deficiencies in prothrombin, a blood clotting factor, caused by anti-clotting therapies (such as warfarin or Coumadin)
  • bleeding disorders in newborn babies
  • low prothrombin levels due to antibiotic use
  • low prothrombin levels caused by lack of vitamin K1 absorption in the intestine
  • low prothrombin levels caused by other drug therapies (such as aspirin therapy)