Vitamin B12 plays a vital role in energy metabolism as it is essential for the synthesis of red blood cells and DNA. This water-soluble vitamin helps convert food into energy by facilitating the metabolism of carbohydrates, fats, and proteins. A deficiency in vitamin B12 can lead to anemia, fatigue, and neurological issues, highlighting its importance in maintaining energy levels. It is primarily found in animal products, making it vital for those following a plant-based diet to consider supplementation or fortified foods. Adequate intake supports overall health and vitality.