Vitamin K is essential for blood clotting and preventing excessive bleeding. Vitamin K, unlike many other vitamins, is not commonly utilised as a dietary supplement.
Vitamin K is actually a collection of chemicals. Vitamins K1 and K2 appear to be the most important of these molecules. Vitamin K1 is found in leafy greens and a few other plants. Vitamin K2 is a class of chemicals derived primarily from meats, cheeses, and eggs and produced by bacteria.
Vitamin K1 is the most common type of vitamin K supplement sold in the United States.
Some people have recently turned to vitamin K2 to treat osteoporosis and steroid-induced bone loss, although the research is mixed. There is not enough data to support utilising vitamin D at this time.