Vitamin K1, also known as phylloquinone, is a fat-soluble vitamin that plays a critical role in the body's ability to form blood clots, a process essential for wound healing and preventing excessive bleeding. It functions by activating certain proteins, such as prothrombin, which are necessary for coagulation. Additionally, Vitamin K1 contributes to bone health by assisting in the regulation of calcium in bones and arteries, helping to prevent osteoporosis and arterial calcification.

Naturally found in green leafy vegetables like spinach, kale, and broccoli, as well as in some vegetable oils, Vitamin K1 is the primary dietary form of vitamin K. It is often used in supplements and food fortification to ensure adequate intake, particularly for individuals who may have dietary restrictions or conditions that impair absorption. In clinical settings, Vitamin K1 is also used to treat and prevent Vitamin K deficiency, which can lead to bleeding disorders. Moreover, it is administered to newborns to prevent hemorrhagic disease of the newborn, a condition that can occur due to insufficient Vitamin K1.

Overall, Vitamin K1 is essential for maintaining normal blood clotting and bone metabolism, making it a vital nutrient for overall health and well-being.