Vitamin K

Definition: Vitamin K is a member of the fat-soluble family of vitamins that also includes vitamin D, vitamin E and vitamin A. Vitamin K is important for normal blood clotting and may help to keep your bones strong as you age.

Vitamin K deficiency is rare, but may occur after long-term use of antibiotics. It is important to note that people who are taking blood thinners should consult with their doctors or pharmacists about vitamin K supplementation because taking extra vitamin K can reduce the effectiveness of blood thinners.

Daily Requirements

Males

1 to 3 years 30 mcg per day
4 to 8 years 55 mcg per day
9 to 13 years 60 mcg per day
14 to 18 years 75 mcg per day
19+ years 120 mcg per day

Females

1 to 3 years 30 mcg per day
4 to 8 years 55 mcg per day
9 to 13 years 60 mcg per day
14 to 18 years 75 mcg per day
19+ years 90 mcg per day

Vitamin K is found in dark green leafy vegetables, cabbage, cauliflower, broccoli, and soybeans. Vitamin K is also synthesized in your digestive tract by friendly bacteria.

Also Known As: Phylloquinone, menaquinone

_Sources:

_{Vitamin K. http://www.nlm.nih.gov/medlineplus/ency/article/002407.htm.}

_{Otten JJ, Hellwig JP, Meyers LD. "Dietary Reference Intakes: The Essential Guide to Nutrient Requirements." IOM, 2006.}