Which vitamin functions as a coenzyme in blood clotting and is synthesized by gut bacteria in humans?

💡 Solution & Explanation

Vitamin K acts as a crucial coenzyme facilitating the gamma-carboxylation of glutamic acid residues in proteins required for blood coagulation. Other vitamins like A, C, and D serve entirely different physiological roles such as vision, collagen synthesis, and calcium regulation. Gut microbes naturally synthesize significant amounts of this vitamin in humans. Vitamin K deficiency leads to prolonged bleeding times and hemorrhage risks.