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Vitamin K1 belongs to the fat-soluble K vitamins. In the human organism it plays an important role in blood coagulation, among other things. It occurs naturally in the chloroplasts of many green (leaf) vegetables such as kale, spinach and broccoli. Spirulina algae and barley grass powder also contain significant amounts of vitamin K1. A deficiency of vitamin K1 is rare; however, as it can occur in a small number of newborns with the consequence of dangerous internal bleeding, vitamin K1 is administered as a precautionary measure in most clinics shortly after birth.