Vitamin K

Medical Encyclopedia: Vitamin K

DHHS. NIH. NLM. MedlinePlus.

MedlinePlus: Vitamin K

DHHS. NIH. National Library of Medicine.

Vitamin K

Oregon State University. Linus Pauling Institute. Micronutrient Information Center.

Vitamin K Deficiency

Merck Manual of Diagnosis and Therapy.

Vitamin K: Another Reason To Eat Your Greens

USDA. Agricultural Research Service.

Vitamin K: Interactions with Coumadin (PDF | 39 KB)

DHHS. NIH. Warren Grant Magnuson Clinical Center.