Ace the NANP Board Exam 2026 – Unleash Your Natural Health Mojo!

The correct answer is Vitamin K, which plays a vital role in the synthesis of proteins that are essential for blood clotting. These proteins, known as clotting factors, are necessary to prevent excessive bleeding when injuries occur. Vitamin K is crucial in a biochemical process known as gamma-carboxylation, which modifies certain proteins to allow them to bind calcium ions—an essential step in the clotting process.

Other vitamins mentioned do have important functions in the body, but they are not directly involved in blood clotting. Vitamin A is key for vision and immune function, Vitamin E acts primarily as an antioxidant protecting cell membranes, and Vitamin D is essential for bone health and calcium absorption. However, none of these vitamins play a role in the synthesis of blood clotting proteins like Vitamin K does.