Vitamin K supplementation in adults
See Clinical aspects of fat-soluble vitamins for the physiological function of vitamin K, and the effects of and risk factors for vitamin K deficiency. Vitamin K can be obtained from a nonfood source, such as bacteria in the gastrointestinal tract which synthesises vitamin K.
To treat vitamin K deficiency in adults, use:
phytomenadione (vitamin K1) 1 to 5 mg orally, daily1. Intravenous administration may be required. phytomenadione phytomenadionephytomenadione
For warfarin reversal, see the Cardiovascular guidelines for phytomenadione (vitamin K1) dosages.
Vitamin K toxicity is uncommon but may occur with supplementation, especially in infants and pregnant people.