What vitamin causes protein coagulation?

Vitamin K plays a crucial role in the coagulation of proteins, especially in the context of blood clotting. It is essential for the synthesis of certain proteins known as clotting factors in the liver, which are necessary for blood coagulation. Specifically, vitamin K is involved in the post-translational modification of these proteins, enabling them to bind calcium ions, which is a critical step in the coagulation cascade.

Without sufficient vitamin K, the body's ability to form clots effectively is impaired, leading to increased bleeding risks. This vitamin is naturally found in foods such as leafy green vegetables and is also produced by bacteria in the gut, highlighting its importance in maintaining hemostatic balance and overall health.

The other vitamins listed do not have a direct role in the coagulation process. Vitamin A is primarily involved in vision and immune function, vitamin B encompasses a group of vitamins important for energy metabolism and neurological function, and vitamin C is known for its role in collagen synthesis and antioxidant properties.