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Vitamin K is a fat-soluble vitamin that plays a key role in blood clotting and bone health. It exists in two main forms: vitamin K1 (phylloquinone), which is found in green leafy vegetables such as spinach, kale, and broccoli, and vitamin K2 (menaquinone), which is produced by bacteria in the gut and is also found in certain fermented foods such as cheese and natto. Vitamin K is essential for the activation of certain proteins involved in blood clotting, and a deficiency in this vitamin can lead to bleeding disorders.