Vitamin K is primarily responsible for blood clotting. It plays a crucial role in synthesizing proteins required for blood coagulation and bone metabolism. The body needs this vitamin to produce clotting factors, which prevent excessive bleeding when injuries occur. There are several forms of vitamin K, with K1 (phylloquinone) found mostly in green leafy vegetables and K2 (menaquinone) produced by bacteria in the gut. Adequate intake of vitamin K through diet or supplements is important for maintaining proper blood clotting function and overall health.