Vitamin B12 is essential for red blood cell production, neurological function, and DNA synthesis, but it does not play a role in blood clotting. A deficiency in B12 can lead to anemia, fatigue, memory problems, and even nerve damage, but it does not impact the clotting cascade — the complex series of events that stop bleeding. The vitamin directly tied to coagulation is vitamin K, which activates clotting factors that help close wounds and prevent internal bleeding. B12 is crucial for blood health in a different way — it ensures that your red blood cells are healthy and oxygen is transported efficiently — but it doesn’t stop bleeding.