Vitamin B12 is a crucial nutrient that helps keep our nerve cells and red blood cells healthy. It plays a key role in making DNA, the genetic material in all our cells. This vitamin is primarily found in animal products like meat, fish, eggs, and dairy, making it important for those who follow a vegetarian or vegan diet to find alternative sources or supplements. A deficiency in B12 can lead to serious health issues, including fatigue, weakness, and neurological problems. It's essential to monitor your intake, especially if you have dietary restrictions. Regular check-ups can help ensure you maintain adequate levels of this vital vitamin.