Spinach, broccoli, lettuce, and cabbage are very rich sources as well, and you can get perfectly respectable amounts of vitamin K in such common foods as oats, green peas, whole wheat, and green beans, as well as watercress and asparagus. Pregnant women, newborn babies, and postmenopausal women are also sometimes deficient in this vitamin. Alcoholism can also lead to vitamin K deficiency. For some purposes, vitamin K has been recommended at a daily dose of 150 to 500 mcg. Although such dosages are much higher than required for nutritional purposes, they are not out of the range of what can be reached through eating plenty of green leafy vegetables.
Recent evidence suggests that vitamin K supplements can be helpful for preventing osteoporosis.
Based on its ability to help blood clot normally, vitamin K has been proposed as a treatment for excessive menstrual bleeding. However, the last actual study testing this idea was carried out more than 55 years ago. 24 Vitamin K has also been recommended for nausea, although there is as yet little evidence that it really works. Osteoporosis Vitamin K plays a known biochemical role in the formation of new bone. This has led researchers to look for relationships between vitamin K intake and osteoporosis.