A coenzyme is a small organic molecule that assists enzymes in catalyzing biochemical reactions. They often act as carriers for chemical groups or electrons, helping to transfer these components between different molecules. Common examples of coenzymes include NAD+, FAD, and coenzyme A, which play crucial roles in metabolism. Coenzymes are typically derived from vitamins, meaning that a deficiency in certain vitamins can lead to a lack of necessary coenzymes. This can disrupt metabolic processes and affect overall health. Understanding coenzymes is essential for studying how enzymes function and how nutrients impact bodily functions.